Fetal development: The 2nd trimester - Mayo Clinic
Fetal development progresses rapidly in the second trimester. Check out the weekly changes.
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Mayo Clinic Complete Book of Pregnancy and Baby's First Year: Mayo Foundation for Medical Education and Research: : Books
Mayo Clinic Complete Book of Pregnancy & Baby's First Year: Mayo Clinic: 9780688117610: : Books
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Fetal development: The 1st trimester - Mayo Clinic
