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Fetal development week by week

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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.

AAFP. 2020. Your baby's development: The first trimester. American Academy of Family Physicians. https://familydoctor.org/your-babys-development-the-first-trimester/Opens a new window [Accessed February 2023]

AAFP. 2021. Your baby's development: The second trimester. American Academy of Family Physicians. https://familydoctor.org/your-babys-development-the-second-trimester/Opens a new window [Accessed February 2023]

AAFP. 2020. Your baby's development: The third trimester. American Academy of Family Physicians. https://familydoctor.org/your-babys-development-the-third-trimester/Opens a new window [Accessed February 2023]

Mayo Clinic. 2022. Fetal development: The 2nd trimester. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20046151Opens a new window [Accessed February 2023]

Mayo Clinic. 2022. Fetal development: The 1st trimester. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/prenatal-care/art-20045302Opens a new window [Accessed February 2023]

Mayo Clinic. 2022. Fetal development: The third trimester. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20045997Opens a new window [Accessed February 2023]

MedlinePlus (ADAM). 2021. Fetal development. https://medlineplus.gov/ency/article/002398.htmOpens a new window [Accessed February 2023]

OWH. 2021. Stages of pregnancy. U.S. Office on Women's Health. https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/stages-pregnancyOpens a new window [Accessed February 2023]

Kate Marple
Kate Marple is a writer and editor who specializes in health, pregnancy, and parenting content. She's passionate about translating complicated medical information into helpful pregnancy and parenting advice that's easy to understand. She lives in San Francisco with her family.
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