Title: Fetal Development by Trimester | Winchester Hospital
Headings: Fetal Development by Trimester
Fetal Development by Trimester
First Trimester Development
Second Trimester Development
Third Trimester Development
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Canadian Resources
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Content: In addition, the mouth, nose, eyes, ears, toes, and fingers begin to form. Your baby’s heart will begin to beat around week 6. It sometimes cannot be heard until around week 10-12. The umbilical cord, which serves to nourish your baby and dispose of his or her wastes throughout the pregnancy, is formed during the first trimester. Nine (9) Week Old Fetus in Utero

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Your baby’s digestive system and reproductive system develops during the first trimester. As his or her muscles continue to form in week nine, your baby may begin to move, but you cannot feel these movements yet. By the end of your first trimester, your baby will be about three inches long and weigh ½ an ounce. Second Trimester Development
In the second trimester, your baby’s hair, including eyebrows and eyelashes, begins to grow. Muscles and bones continue to develop, allowing more movement. If your baby is a girl, her eggs will develop in her ovaries early in the second trimester.