Pregnancy Stages

Third Trimester (37-40 Weeks)

Third Trimester: The Baby at 37 to 40 Weeks By the end of 37 weeks, your baby is considered full term. Your baby's organs are ready to function on their own. As you near your due date, your baby may turn into a head-down position for birth. Most babies "present" head down. At birth, your baby may weigh somewhere between 6 pounds, 2 ounces and 9 pounds, 2 ounces and be 19 to 21 inches long. Most full-term babies fall within these ranges. But healthy babies come in many different sizes.

Third Trimester (36 Weeks)

Third Trimester: The Baby at 36 Weeks The protective waxy coating called vernix gets thicker. Body fat increases. Your baby is getting bigger and bigger and has less space to move around. Movements are less forceful, but you will feel stretches and wiggles. Your baby is about 16 to 19 inches long and weighs about 6 to 6½ pounds.

Third Trimester (32 Weeks)

Third Trimester: The Baby at 32 Weeks Your baby's bones are fully formed, but still soft. Your baby's kicks and jabs are forceful. The eyes can open and close and sense changes in light. Lungs are not fully formed, but practice "breathing" movements occur. Your baby's body begins to store vital minerals, such as iron and calcium. Lanugo begins to fall off. Your baby is gaining weight quickly, about ½ pound a week. Now, your baby is about 15 to 17 inches long and weighs about 4 to 4½ pounds.

Second Trimester (24 Weeks)

Second Trimester: The Baby at 24 Weeks Bone marrow begins to make blood cells. Taste buds form on your baby's tongue. Footprints and fingerprints have formed. Real hair begins to grow on your baby's head. The lungs are formed, but do not work. The hand and startle reflex develop. Your baby sleeps and wakes regularly. If your baby is a boy, his testicles begin to move from the abdomen into the scrotum. If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs have formed in the ovaries. Your baby stores fat and has gained quite a bit of weight. Now at about 12 inches long, your baby weighs about 1½ pounds.

Second Trimester (20 Weeks)

Second Trimester: The Baby at 20 Weeks Your baby is more active. You might feel slight fluttering. Your baby is covered by fine, downy hair called lanugo (luh-NOO-goh) and a waxy coating called vernix. This protects the forming skin underneath. Eyebrows, eyelashes, fingernails, and toenails have formed. Your baby can even scratch itself. Your baby can hear and swallow. Now halfway through your pregnancy, your baby is about 6 inches long and weighs about 9 ounces.

Second Trimester (16 Weeks)

Second Trimester: The Baby at 16 Weeks Muscle tissue and bone continue to form, creating a more complete skeleton. Skin begins to form. You can nearly see through it. Meconium (mih-KOH-nee-uhm) develops in your baby's intestinal tract. This will be your baby's first bowel movement. Your baby makes sucking motions with the mouth (sucking reflex). Your baby reaches a length of about 4 to 5 inches and weighs almost 3 ounces.

First Trimester (12 Weeks)

First Trimester: The Baby at 12 Weeks The nerves and muscles begin to work together. Your baby can make a fist. The external sex organs show if your baby is a boy or girl. A woman who has an ultrasound in the second trimester or later might be able to find out the baby's sex. Eyelids close to protect the developing eyes. They will not open again until the 28th week. Head growth has slowed, and your baby is much longer. Now, at about 3 inches long, your baby weighs almost an ounce.

First Trimester (8 Weeks)

First Trimester: The Baby at 8 Weeks All major organs and external body structures have begun to form. Your baby's heart beats with a regular rhythm. The arms and legs grow longer, and fingers and toes have begun to form. The sex organs begin to form. The eyes have moved forward on the face and eyelids have formed. The umbilical cord is clearly visible. At the end of 8 weeks, your baby is a fetus and looks more like a human. Your baby is nearly 1 inch long and weighs less than 1/8 of an ounce.

First Trimester (4 Weeks)

First Trimester: The Baby at 4 Weeks Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and 1/25 of an inch long.

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