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Women's Center at Westover Hills
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(210) 858-1101

1st Trimester

From Tiny Cells to a Tiny Baby

1-13 Weeks

The amniotic sac, which is a water tight sac that forms around the fertilized egg, helps cushion the growing embryo throughout the pregnancy.

The placenta also develops during the first trimester. It is a round, flat organ that transfers nutrients from the mother to the growing baby.

By the end of the first month of pregnancy your baby is 6-7 mm (1/4 inch) long which is the size of a grain of rice.

During the second month of pregnancy development continues with the ears, tiny buds that will become arms and legs and the neural tube system (brain, spinal cord, and central nervous system) is well formed.

By the end of the second month your baby is now called a fetus and is about 1 inch long and weighs about 1/3 ounce. The head makes up about 1/3 of the baby.

By the end of the third month of pregnancy, your baby is fully formed. Your baby has arms, hands, fingers, feet, and toes. It can open and close its mouth and fists. The teeth and nails are starting to form. The reproductive organs are beginning to develop although will not be distinguishable on ultrasound for many more weeks. The circulatory and urinary systems are working and the liver is producing bile.

At the end of the third month your baby is about 3-4 inches long and weighs about 1 ounce.

From Our Patients

“She is a great doctor, and brings with her a sense of comfort hard to find in other professionals. I’d recommend her to everyone! Thank you, Dr. Akonye, for your dedication.” – Priscilla Terrazas