The first trimester is a time of rapid development for your baby. Because your baby is growing so quickly, it is important that you start a healthy lifestyle right away. By the end of the first trimester, your baby has formed all of its major body organs and weighs just over an ounce.
The placenta (the organ that nourishes your baby) begins to form. The heart and lungs begin to develop. Your baby is about 1/4 inch long by the end of the first month.
All of your baby’s major body organs form. The face, fingers, toes, ears, and eyes appear. By the end of the month, your baby is about 1 inch long.
Your baby can open and close its fists and mouth. The sexual organs begin to form. As the first trimester ends, your baby is about 4 inches long.
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