Title: How Your Fetus Grows During Pregnancy | ACOG
Headings: How Your Fetus Grows During Pregnancy
FAQs
How Your Fetus Grows During Pregnancy
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If you have further questions, contact your ob-gyn.
A Guide to Pregnancy from Ob-Gyns

Content: Cardiac tissue starts to develop. Muscles of the eyes, nose, and mouth form. Webbed fingers and toes poke out from developing hands and feet. The lungs start to form the tubes that will carry air in and out after birth. The inner ear begins to develop. What happens during weeks 9 to 12 of pregnancy? Cartilage for the limbs, hands, and feet start to form but won’t harden into bones for a few weeks. Eyelids form but remain closed. Genitals begin to form. Liver begins development.