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Twins in the womb: Fetal development month by month

two babies sleeping next to each other
Photo credit: Thinkstock
illustration of a twin fetal development in a womb
illustration of twins in the womb at early pregnancy stage
illustration of twin embryos growing in woman's body
illustration of a womans uterus showing twin fetuses developing
illustration of a womans uterus showing twin fetuses developing
illustration of a woman's uterus showing twin fetuses developing
illustration of a twin fetal development in a womb
illustration of a twin fetal development in a womb
illustration of a twin fetal development in a womb
illustration of two babies in the womb
pregnant woman touching belly
Follow your baby's amazing development
Sources

BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies.

ACOG. 2020. How your fetus grows during pregnancy. American College of Obstetricians and Gynecologists. https://www.acog.org/womens-health/faqs/how-your-fetus-grows-during-pregnancyOpens a new window [Accessed August 2021]

ACOG. 2021. Multiple pregnancy. American College of Obstetricians and Gynecologists. https://www.acog.org/womens-health/faqs/multiple-pregnancyOpens a new window [Accessed August 2021]

Cleveland Clinic. 2020. Fetal development: Stage of growth. https://my.clevelandclinic.org/health/articles/7247-fetal-development-stages-of-growthOpens a new window [Accessed August 2021]

Hiersch L et al. 2020. Differences in fetal growth patterns between twins and singletons. National Library of Medicine. https://pubmed.ncbi.nlm.nih.gov/30501543/Opens a new window [Accessed August 2021]

Johns Hopkins. Undated. Twin pregnancy: Answers from an expert. https://www.hopkinsmedicine.org/health/conditions-and-diseases/staying-healthy-during-pregnancy/twin-pregnancy-answers-from-maternal-fetal-medicine-specialistOpens a new window [Accessed August 2021]

Mayo Clinic. 2018. Twin pregnancy: What multiples mean for mom. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/twin-pregnancy/art-20048161Opens a new window [Accessed August 2021]

MedlinePlus (ADAM). 2021. Fetal development. https://medlineplus.gov/ency/article/002398.htmOpens a new window [Accessed August 2021]

Karen Miles
Karen Miles is a writer and an expert on pregnancy and parenting who has contributed to BabyCenter for more than 20 years. She's passionate about bringing up-to-date, useful information to parents so they can make good decisions for their families. Her favorite gig of all is being "Mama Karen" to four grown children and "Nana" to nine grandkids.
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