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Pregnancy and Fetal Development
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Picture of First Trimester (4 Weeks)
Picture of First Trimester (4 Weeks)
At 4 weeks gestational age, a baby in the first trimester starts to grow a brain, spinal cord, and heart. Arm and leg buds begin to form. The baby is considered an embryo at this point and is 1/25 of an inch long.
Image Source: Copyright © Medical RF / Phototake -- All rights reserved.

Text Reference: American Pregnancy Association: "Fetal Development"
Picture of First Trimester (8 Weeks)
Picture of First Trimester (4 Weeks)

At 8 weeks during the first trimester, a baby has the following features:

Organs and body structures are beginning to take form.
The heart beats in a customary rhythm.
The limbs are growing longer and the fingers and toes are starting to form.
The sex organs are beginning to form.
The eyes move into a forward position on the face. Eyelids are apparent.
The umbilical cord is visible.
At 8 weeks gestational age, your baby is almost 1 inch long and weighs less than 1/8th of an ounce.

Image Source: Copyright © Scott Camazine / Phototake -- All rights reserved.

Text Reference: American Pregnancy Association: “Fetal Development: First Trimester”
Picture of First Trimester (12 Weeks)
Picture of First Trimester (12 Weeks)

A baby in the first trimester at 12 weeks has the following features:

Muscles and nerves are coordinated. Baby can make a fist.
The baby's eyelids are closed and will not open until 28 weeks' gestation.
The growth of the head is slower and the baby has grown longer. Your baby weighs nearly one ounce and is about 3 inches long.
The external sex organs show the baby's gender, but this is not distinguishable on ultrasound until the second trimester or later.

Image Source: 043705B000261-01 Copyright © LookatSciences / Phototake -- All rights reserved.

Text Reference: American Pregnancy Association: “Fetal Development: First Trimester”
Picture of Second Trimester (16 Weeks)
Picture of Second Trimester (16 Weeks)

This photo shows a baby at 16 weeks of gestation during the second trimester of pregnancy. At this stage:

Tissues including bones and muscles continue to form.
The baby begins to develop translucent skin.
The baby begins to form a substance called meconium, which is the first bowel movement.
The baby displays a sucking reflex with the mouth.
The baby weighs approximately 3 ounces and is between 4 to 5 inches in length at this time.

Image Source: Nestle / Petit Format / Photo Researchers, Inc.

Text Reference: American Pregnancy Association: "Fetal Development: Second Trimester"
Picture of Second Trimester (20 Weeks)
Picture of Second Trimester (20 Weeks)

This photo shows a baby at 20 weeks gestational age during the second trimester of pregnancy. At this stage:

The baby is active and you may feel him or her moving more.
The baby is enveloped in a protective coating called vernix and lanugo, fine hair. These protect developing skin that lies underneath.
Fingernails, toenails, eyebrows, and eyelashes have formed. The baby is capable of scratching him or herself.
The baby is able to hear and swallow at this stage.
The baby weighs approximately 9 ounces and is about 6 inches long at this stage.

Image Source: Petit Format / Photo Researchers, Inc.

Text Reference: American Pregnancy Association: "Fetal Development: Second Trimester"
Picture of Second Trimester (24 Weeks)
Picture of Second Trimester (24 Weeks)

The second trimester of pregnancy refers to a fetus at 24 weeks gestational age. At this stage, the baby is about 12 inches long and weighs approximately 1 1/2 pounds. Taste buds, footprints, and fingerprints form. The baby's bone marrow starts to manufacture blood cells. The infant experiences sleep and wake cycles. Hair begins to grow on the head. Lungs develop but are not yet functional. The baby begins to have hand and startle reflexes. In males, testicles begin to descend from the abdomen into the scrotum. In females, the ovaries and uterus are in the correct anatomical position and the ovaries contain a lifetime supply of eggs.
Image Source: Neil Bromhall / Genesis Films / Photo Researchers, Inc.

Text References: American Pregnancy Association: "Pregnancy Week 24"

WomensHealth.gov: "Stages of Pregnancy"
Picture of Third Trimester (32 Weeks)
Picture of Third Trimester (32 Weeks)

This photo shows a baby at 32 weeks of gestation during the third trimester. At this stage:

The baby's skeleton is formed although the bones are soft.
The baby is able to kick and jab with force.
The baby's eyes are able to open and close and detect changes in light.
The baby's lungs are not completely formed but they practice movements that simulate breathing.
The baby accumulates stores of minerals including calcium and iron.
The fine hair coating the baby, lanugo, begins to shed.
The baby weighs approximately 4 to 4 ½ pounds and is approximately 15 to 17 inches in length.
Weight gain is very fast now. The baby gains approximately ½ pound per week during this stage.

Image Source: Petit Format / Photo Researchers, Inc.

Text Reference: American Pregnancy Association: "Fetal Development: Third Trimester"
Picture of Third Trimester (36 Weeks)
Picture of Third Trimester (36 Weeks)

This photo shows a baby at 36 weeks of gestational age during the third trimester. During this stage:

The waxy coating that protects the skin (vernix) becomes thicker.
The baby accumulates more body fat. The infant has much less room to move around in the womb.
The baby weighs approximately 6 to 6 ½ pounds and is between 16 to 19 inches in length.

Image Source: Copyright © LookatSciences / Phototake -- All rights reserved.

Text Reference: American Pregnancy Association: "Fetal Development: Third Trimester"
Picture of Third Trimester (37-40 Weeks)
Picture of Third Trimester (37-40 Weeks)

The third trimester refers to weeks 37 to 40 of a pregnancy. At this time, the baby is full term and preparing for birth by turning head down. The majority of healthy babies weigh anywhere between 6 ¾ to 10 pounds and are about 19 to 21 inches long.

Image Source: iStockphoto / Don Bayley

Text Reference: "Fetal Development: Third Trimester." American Pregnancy Association.