First Trimester

During the first trimester, you experience few signs of pregnancy. Yet, your baby is growing fast and developing all their major organs. These three months are critical to your baby’s health. The following is information about your baby’s development, changes to expect in your body, and important tips to keep in mind during the next three months.

Medium Shot Couple Holding Ultrasound


For the first six weeks, the baby is called an embryo. The lungs and brain are starting to develop, and the tiny heart will begin beating on the 25th day. To protect it from bumps and pressure, the embryo is enclosed in a fluid-filled sac, which will grow into birth. The umbilical cord is also developing, made up of blood vessels. The cord will carry nourishment from your body to the baby and carry away the baby’s waste.

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Fetal Development

Week Of Pregnancy (First Trimester3.5-Weeks
Week Of Pregnancy (First Trimester7.5-Weeks
Week Of Pregnancy (First Trimester8.5-Weeks
Week Of Pregnancy (First Trimester Weeks 9 And 10
Week Of Pregnancy (First Trimester)Week 11-12
Week Of Pregnancy (First Trimester)Weak 14-15-16
Week Of Pregnancy (First Trimester)Weak 17--18-19
Week Of Pregnancy (First Trimester)Weak 28-26
Week Of Pregnancy (First Trimester)Weak 30-32


During month two, the embryo becomes a fetus. Arms with tiny hands and fingers are seen, along with legs and the beginnings of knees, ankles, and toes. The stomach and liver also begin to develop. The brain is growing fast, and the head seems very large compared to the rest of the body. Tiny ears start forming, and hair begins to grow.

Fetal Development


The baby is now about three inches long and weighs about one ounce. Signs of the baby’s sex begin to appear. Finger and toenails are also developing. By the end of the month, you will have gained three or four pounds.

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