Suchergebnisse - "Premature Birth"

First-trimester cervical length screening and the risk of preterm birth: a systematic review and meta-analysis.

Autoren: Hantoushzadeh S Saedi N Jafarabady K et al.

Quelle: BMC pregnancy and childbirth [BMC Pregnancy Childbirth] 2025 Oct 06; Vol. 25 (1), pp. 1018. Date of Electronic Publication: 2025 Oct 06.

Publikationsart: Journal Article; Systematic Review; Meta-Analysis

Info zur Zeitschrift: Publisher: BioMed Central Country of Publication: England NLM ID: 100967799 Publication Model: Electronic Cited Medium: Internet ISSN: 1471-2393 (Electronic) Linking ISSN: 14712393 NLM ISO Abbreviation: BMC Pregnancy Childbirth Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/epidemiology , Premature Birth*/etiology , Cervical Length Measurement*/statistics & numerical data , Pregnancy Trimester, First* , Cervix Uteri*/diagnostic imaging, Humans ; Pregnancy ; Female ; Risk Factors

Association Between Elevated Maternal BMI, Cervical Length, and Spontaneous Preterm Birth in Persons at Increased Risk of Spontaneous Preterm Birth.

Autoren: Crane J O'Brien D

Quelle: Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC [J Obstet Gynaecol Can] 2025 Oct; Vol. 47 (10), pp. 103090. Date of Electronic Publication: 2025 Aug 26.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Elsevier Country of Publication: Netherlands NLM ID: 101126664 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 2665-9867 (Electronic) Linking ISSN: 17012163 NLM ISO Abbreviation: J Obstet Gynaecol Can Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/etiology , Premature Birth*/epidemiology , Body Mass Index* , Cervical Length Measurement* , Cervix Uteri*/diagnostic imaging, Humans ; Female ; Pregnancy ; Retrospective Studies ; Adult ; Risk Factors

Impact of Implementation Tools for Spontaneous Preterm Birth Guidelines: A Systematic Review and Meta-Analysis.

Autoren: Hunter B Jordan V Wimsett J et al.

Quelle: BJOG : an international journal of obstetrics and gynaecology [BJOG] 2025 Oct; Vol. 132 (11), pp. 1543-1561. Date of Electronic Publication: 2025 May 14.

Publikationsart: Journal Article; Meta-Analysis; Systematic Review

Info zur Zeitschrift: Publisher: Wiley-Blackwell Country of Publication: England NLM ID: 100935741 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1471-0528 (Electronic) Linking ISSN: 14700328 NLM ISO Abbreviation: BJOG Subsets: MEDLINE

MeSH-Schlagworte: Guideline Adherence*/statistics & numerical data , Practice Guidelines as Topic* , Premature Birth*/ethnology , Premature Birth*/therapy, Female ; Humans ; Pregnancy

[THE PERINATAL LOSSES IN THE REGIONS OF THE ARCTIC ZONE OF THE RUSSIAN FEDERATION: ANALYSIS OF DYNAMICS AND AVERTABILITY].

Autoren: Starodubov VI Postoev VA Kurochka DV et al.

Quelle: Problemy sotsial'noi gigieny, zdravookhraneniia i istorii meditsiny [Probl Sotsialnoi Gig Zdravookhranenniiai Istor Med] 2025 Dec 15; Vol. 33 (4), pp. 557-566. Date of Electronic Publication: 2025 Dec 15.

Publikationsart: English Abstract; Journal Article

Info zur Zeitschrift: Publisher: Akt︠s︡ionernoe obshchestvo “Shiko Country of Publication: Russia (Federation) NLM ID: 101270373 Publication Model: Electronic Cited Medium: Print ISSN: 0869-866X (Print) Linking ISSN: 0869866X NLM ISO Abbreviation: Probl Sotsialnoi Gig Zdravookhranenniiai Istor Med Subsets: MEDLINE

MeSH-Schlagworte: Perinatal Mortality*/trends , Infant Mortality*/trends , Premature Birth*/epidemiology, Humans ; Russia/epidemiology ; Arctic Regions/epidemiology ; Infant, Newborn ; Female ; Pregnancy ; Infant

Modulation of the PGRMC1/NLRP7/HLA-C axis by autophagy is linked to both spontaneous preterm birth and gestational choriocarcinoma.

Autoren: Li Q Yu H Ling D et al.

Quelle: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2025 Dec 02; Vol. 122 (48), pp. e2509798122. Date of Electronic Publication: 2025 Nov 24.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: National Academy of Sciences Country of Publication: United States NLM ID: 7505876 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1091-6490 (Electronic) Linking ISSN: 00278424 NLM ISO Abbreviation: Proc Natl Acad Sci U S A Subsets: MEDLINE

MeSH-Schlagworte: Choriocarcinoma*/metabolism , Choriocarcinoma*/pathology , Choriocarcinoma*/genetics , Receptors, Progesterone*/metabolism , Receptors, Progesterone*/genetics , Membrane Proteins*/metabolism , Membrane Proteins*/genetics , Autophagy* , Premature Birth*/metabolism , Premature Birth*/pathology , Premature Birth*/genetics , HLA-C Antigens*/metabolism , HLA-C Antigens*/genetics , Adaptor Proteins, Signal Transducing*/metabolism , Adaptor Proteins, Signal Transducing*/genetics , Uterine Neoplasms*/metabolism , Uterine Neoplasms*/pathology , Uterine Neoplasms*/genetics, Humans ; Female ; Pregnancy ; Progesterone/metabolism ; Trophoblasts/metabolism ; Trophoblasts/pathology ; Cell Line, Tumor ; Placenta/metabolism

Implementation protocol for a treatment bundle targeting modifiable risk factors for preterm birth.

Autoren: Roque de Castro G Milani Biazotto B Rodrigues da Silva I et al.

Quelle: Global health action [Glob Health Action] 2025 Dec; Vol. 18 (1), pp. 2558366. Date of Electronic Publication: 2025 Nov 12.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Taylor & Francis Country of Publication: United States NLM ID: 101496665 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1654-9880 (Electronic) Linking ISSN: 16549880 NLM ISO Abbreviation: Glob Health Action Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/prevention & control , Premature Birth*/epidemiology , Patient Care Bundles*/methods, Humans ; Female ; Pregnancy ; Risk Factors ; Brazil/epidemiology ; Adult ; Vagina/microbiology ; Surveys and Questionnaires

Causal associations of mood swings with preterm birth: a Mendelian randomization analysis.

Autoren: Xia Y Zhang J Shang Y

Quelle: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians [J Matern Fetal Neonatal Med] 2025 Dec; Vol. 38 (1), pp. 2556885. Date of Electronic Publication: 2025 Sep 10.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 101136916 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4954 (Electronic) Linking ISSN: 14764954 NLM ISO Abbreviation: J Matern Fetal Neonatal Med Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/etiology , Premature Birth*/epidemiology , Premature Birth*/genetics , Mood Disorders*/complications , Mood Disorders*/epidemiology, Humans ; Mendelian Randomization Analysis ; Female ; Pregnancy ; Risk Factors ; Infant, Newborn ; Adult

Association of sleep traits with risk of adverse pregnancy outcomes: a Mendelian randomisation analysis.

Autoren: Shao S Shuai Z Qin C et al.

Quelle: Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology [J Obstet Gynaecol] 2025 Dec; Vol. 45 (1), pp. 2516605. Date of Electronic Publication: 2025 Jun 18.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 8309140 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1364-6893 (Electronic) Linking ISSN: 01443615 NLM ISO Abbreviation: J Obstet Gynaecol Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/genetics , Premature Birth*/epidemiology , Premature Birth*/etiology , Diabetes, Gestational*/genetics , Diabetes, Gestational*/epidemiology , Diabetes, Gestational*/etiology , Fetal Growth Retardation*/genetics , Fetal Growth Retardation*/epidemiology , Fetal Growth Retardation*/etiology , Sleep*/genetics , Sleep Apnea Syndromes*/genetics , Sleep Apnea Syndromes*/complications , Pregnancy Complications*/genetics , Pregnancy Complications*/epidemiology, Humans ; Pregnancy ; Female ; Mendelian Randomization Analysis ; Genome-Wide Association Study ; Risk Factors ; Pregnancy Outcome/epidemiology ; Adult ; Disorders of Excessive Somnolence/genetics ; Disorders of Excessive Somnolence/complications

Relationship between gastrointestinal disturbances, blood lipid levels, inflammatory markers, and preterm birth.

Autoren: Hu L Li J Zhang M et al.

Quelle: Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology [J Obstet Gynaecol] 2025 Dec; Vol. 45 (1), pp. 2475065. Date of Electronic Publication: 2025 Apr 20.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 8309140 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1364-6893 (Electronic) Linking ISSN: 01443615 NLM ISO Abbreviation: J Obstet Gynaecol Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/blood , Premature Birth*/etiology , Premature Birth*/epidemiology , Lipids*/blood , Gastrointestinal Diseases*/blood , Gastrointestinal Diseases*/complications, Humans ; Female ; Pregnancy ; Adult ; Biomarkers/blood ; C-Reactive Protein/analysis ; Inflammation/blood ; Case-Control Studies ; Intestine, Small/microbiology

The causal relationship between gut microbiota and preterm birth: a two-sample Mendelian randomization study.

Autoren: Zhu T Shen D Cai X et al.

Quelle: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians [J Matern Fetal Neonatal Med] 2025 Dec; Vol. 38 (1), pp. 2432528. Date of Electronic Publication: 2024 Dec 25.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 101136916 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4954 (Electronic) Linking ISSN: 14764954 NLM ISO Abbreviation: J Matern Fetal Neonatal Med Subsets: MEDLINE

MeSH-Schlagworte: Mendelian Randomization Analysis* , Gastrointestinal Microbiome*/genetics , Premature Birth*/microbiology , Premature Birth*/genetics , Premature Birth*/epidemiology , Polymorphism, Single Nucleotide* , Genome-Wide Association Study*, Humans ; Female ; Pregnancy ; Infant, Newborn

Effects of the need for in-vitro fertilization to conceive on pregnancy risks in women with the polycystic ovary syndrome. Evaluation of a population database and a matched cohort.

Autoren: Peeva M Badeghiesh A Baghlaf H et al.

Quelle: European journal of obstetrics, gynecology, and reproductive biology [Eur J Obstet Gynecol Reprod Biol] 2025 Dec; Vol. 315, pp. 114742. Date of Electronic Publication: 2025 Sep 30.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Elsevier Scientific Publishers Country of Publication: Ireland NLM ID: 0375672 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1872-7654 (Electronic) Linking ISSN: 03012115 NLM ISO Abbreviation: Eur J Obstet Gynecol Reprod Biol Subsets: MEDLINE

MeSH-Schlagworte: Polycystic Ovary Syndrome*/complications , Polycystic Ovary Syndrome*/therapy , Fertilization in Vitro*/adverse effects , Premature Birth*/epidemiology , Premature Birth*/etiology , Pregnancy Complications*/epidemiology , Pregnancy Complications*/etiology, Humans ; Female ; Pregnancy ; Adult ; Retrospective Studies ; Pregnancy Outcome ; Databases, Factual ; Cohort Studies ; Risk Factors

Preterm birth trends in the United States post aspirin recommendation guidelines.

Autoren: Ayyash MK Al-Kouatly HB Shaman M et al.

Quelle: Journal of the National Medical Association [J Natl Med Assoc] 2025 Dec; Vol. 117 (6), pp. 378-383. Date of Electronic Publication: 2025 Aug 22.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Elsevier Country of Publication: United States NLM ID: 7503090 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1943-4693 (Electronic) Linking ISSN: 00279684 NLM ISO Abbreviation: J Natl Med Assoc Subsets: MEDLINE

MeSH-Schlagworte: Aspirin*/therapeutic use , Premature Birth*/epidemiology , Premature Birth*/prevention & control, Humans ; United States/epidemiology ; Retrospective Studies ; Female ; Pregnancy ; Practice Guidelines as Topic ; Adult ; Infant, Newborn

The impact of extreme air pollution on preterm birth in twin pregnancies: identifying susceptible exposure windows.

Autoren: Xu WZ Tang WZ Cai QY et al.

Quelle: Annals of medicine [Ann Med] 2025 Dec; Vol. 57 (1), pp. 2534854. Date of Electronic Publication: 2025 Jul 20.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 8906388 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-2060 (Electronic) Linking ISSN: 07853890 NLM ISO Abbreviation: Ann Med Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/epidemiology , Premature Birth*/etiology , Air Pollution*/adverse effects , Air Pollution*/analysis , Pregnancy, Twin*/statistics & numerical data , Air Pollutants*/analysis , Air Pollutants*/adverse effects , Maternal Exposure*/adverse effects , Maternal Exposure*/statistics & numerical data , Environmental Exposure*/adverse effects, Humans ; Female ; Pregnancy ; China/epidemiology ; Adult ; Particulate Matter/analysis ; Particulate Matter/adverse effects ; Infant, Newborn ; Gestational Age ; Sulfur Dioxide/analysis ; Environmental Monitoring/methods ; Risk Factors ; Ozone/analysis

Can inflammatory markers predict the risk of preterm and early preterm birth in women with threatened preterm labor?

Autoren: Bezirganoglu Altuntas N Baki Yıldırım S Bayoglu Tekin Y

Quelle: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians [J Matern Fetal Neonatal Med] 2025 Dec; Vol. 38 (1), pp. 2566235. Date of Electronic Publication: 2025 Oct 06.

Publikationsart: Journal Article; Observational Study

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 101136916 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4954 (Electronic) Linking ISSN: 14764954 NLM ISO Abbreviation: J Matern Fetal Neonatal Med Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/blood , Premature Birth*/etiology , Premature Birth*/epidemiology , Obstetric Labor, Premature*/blood , Inflammation*/blood, Humans ; Female ; Pregnancy ; Adult ; Prospective Studies ; Biomarkers/blood ; Risk Factors ; Neutrophils ; Infant, Newborn ; Gestational Age

Differential predictive utility of preoperative cervical length for preterm birth among various indications for cervical cerclage: a retrospective cohort study.

Autoren: Long N Fu Y Wang Z et al.

Quelle: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians [J Matern Fetal Neonatal Med] 2025 Dec; Vol. 38 (1), pp. 2479751. Date of Electronic Publication: 2025 Mar 20.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 101136916 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4954 (Electronic) Linking ISSN: 14764954 NLM ISO Abbreviation: J Matern Fetal Neonatal Med Subsets: MEDLINE

MeSH-Schlagworte: Cerclage, Cervical*/statistics & numerical data , Premature Birth*/prevention & control , Premature Birth*/epidemiology , Premature Birth*/etiology , Cervical Length Measurement*/statistics & numerical data , Cervix Uteri*/diagnostic imaging , Cervix Uteri*/surgery, Humans ; Female ; Pregnancy ; Retrospective Studies ; Adult ; Predictive Value of Tests ; Young Adult ; Uterine Cervical Incompetence/surgery ; Preoperative Period ; China ; ROC Curve

Mid-Trimester Allostatic Load and Spontaneous Preterm Birth in a Cohort of Pregnant Women Living with HIV in Zambia.

Autoren: Rittenhouse KJ Vwalika B Sebastião YV et al.

Quelle: Maternal and child health journal [Matern Child Health J] 2025 Dec; Vol. 29 (12), pp. 1759-1770. Date of Electronic Publication: 2025 Oct 24.

Publikationsart: Journal Article; Randomized Controlled Trial

Info zur Zeitschrift: Publisher: Kluwer Academic/Plenum Publishers Country of Publication: United States NLM ID: 9715672 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1573-6628 (Electronic) Linking ISSN: 10927875 NLM ISO Abbreviation: Matern Child Health J Subsets: MEDLINE

MeSH-Schlagworte: HIV Infections*/complications , HIV Infections*/epidemiology , Premature Birth*/epidemiology , Premature Birth*/etiology , Allostasis*/physiology , Pregnancy Trimester, Second* , Pregnancy Complications, Infectious*/epidemiology, Humans ; Female ; Pregnancy ; Zambia/epidemiology ; Adult ; Biomarkers/blood ; Biomarkers/analysis ; Cohort Studies ; Pregnant People/psychology ; Case-Control Studies

The predictive role of maternal serum and cervicovaginal fluid vitamin D-binding protein for preterm birth and latency period.

Autoren: Ozen AN Ozgen G Dincgez B et al.

Quelle: Zeitschrift fur Geburtshilfe und Neonatologie [Z Geburtshilfe Neonatol] 2025 Dec; Vol. 229 (6), pp. 403-408. Date of Electronic Publication: 2025 Jul 22.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Ferdinand Enke Verlag Country of Publication: Germany NLM ID: 9508901 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1439-1651 (Electronic) Linking ISSN: 09482393 NLM ISO Abbreviation: Z Geburtshilfe Neonatol Subsets: MEDLINE

MeSH-Schlagworte: Vitamin D-Binding Protein*/blood , Vitamin D-Binding Protein*/analysis , Vitamin D-Binding Protein*/metabolism , Premature Birth*/diagnosis , Premature Birth*/blood , Premature Birth*/metabolism , Cervix Uteri*/metabolism , Cervix Uteri*/chemistry, Humans ; Female ; Pregnancy ; Adult ; Biomarkers/blood ; Biomarkers/analysis ; Sensitivity and Specificity ; Case-Control Studies ; Predictive Value of Tests ; Vagina/metabolism ; Prospective Studies ; Body Fluids/chemistry ; Fetal Membranes, Premature Rupture/diagnosis ; Fetal Membranes, Premature Rupture/blood ; Young Adult ; Reproducibility of Results ; Infant, Newborn

Preterm birth rates and risk factors among women with cervical incompetence undergoing prophylactic cerclage: a systematic review and meta-analysis.

Autoren: Wang J Rong HJ Wang XM et al.

Quelle: Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology [J Obstet Gynaecol] 2025 Dec; Vol. 45 (1), pp. 2549996. Date of Electronic Publication: 2025 Sep 03.

Publikationsart: Journal Article; Systematic Review; Meta-Analysis

Info zur Zeitschrift: Publisher: Informa Healthcare Country of Publication: England NLM ID: 8309140 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1364-6893 (Electronic) Linking ISSN: 01443615 NLM ISO Abbreviation: J Obstet Gynaecol Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/epidemiology , Premature Birth*/etiology , Premature Birth*/prevention & control , Cerclage, Cervical*/statistics & numerical data , Cerclage, Cervical*/adverse effects , Uterine Cervical Incompetence*/surgery, Humans ; Female ; Pregnancy ; Risk Factors ; Adult ; Infant, Newborn

Predicting spontaneous preterm birth with cervical length and fetal fibronectin for symptomatic women of threatened preterm labor: A prospective study.

Autoren: Fung JCY Chaemsaithong P Chen Y et al.

Quelle: Acta obstetricia et gynecologica Scandinavica [Acta Obstet Gynecol Scand] 2025 Dec; Vol. 104 (12), pp. 2292-2299. Date of Electronic Publication: 2025 Oct 12.

Publikationsart: Journal Article

Info zur Zeitschrift: Publisher: Wiley Country of Publication: United States NLM ID: 0370343 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1600-0412 (Electronic) Linking ISSN: 00016349 NLM ISO Abbreviation: Acta Obstet Gynecol Scand Subsets: MEDLINE

MeSH-Schlagworte: Fibronectins*/metabolism , Fibronectins*/analysis , Cervical Length Measurement* , Premature Birth*/diagnosis , Premature Birth*/metabolism , Obstetric Labor, Premature*/diagnosis , Obstetric Labor, Premature*/metabolism , Cervix Uteri*/diagnostic imaging, Humans ; Female ; Pregnancy ; Prospective Studies ; Adult ; Predictive Value of Tests ; ROC Curve ; Gestational Age ; Biomarkers/metabolism

Vaginal microbiome and preterm birth: Composition, mechanisms and microbiota‑directed therapies (Review).

Autoren: Cheng D Li N Sun Q et al.

Quelle: International journal of molecular medicine [Int J Mol Med] 2025 Dec; Vol. 56 (6). Date of Electronic Publication: 2025 Sep 26.

Publikationsart: Journal Article; Review

Info zur Zeitschrift: Publisher: D.A. Spandidos Country of Publication: Greece NLM ID: 9810955 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1791-244X (Electronic) Linking ISSN: 11073756 NLM ISO Abbreviation: Int J Mol Med Subsets: MEDLINE

MeSH-Schlagworte: Premature Birth*/microbiology , Premature Birth*/therapy , Premature Birth*/etiology , Premature Birth*/prevention & control , Vagina*/microbiology , Microbiota*, Humans ; Female ; Pregnancy ; Dysbiosis/microbiology ; Probiotics/therapeutic use