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month 4, 2nd trimester
The nervous system is starting to function at this point in pregnancy. The reproductive organs and genitalia are now fully developed, and your health care provider can see on ultrasound if you are having a boy or a girl. Your baby's heartbeat may now be audible through an instrument called a Doppler. By the end of the fourth month, your baby is about 6 inches long and weighs about 4 ounces. -
ovulation
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egg and sperm
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month 3, 1st trimester
By the end of the third month of pregnancy, your baby is fully formed. Your baby has arms, hands, fingers, feet, and toes and can open and close its fists and mouth. Fingernails and toenails are beginning to develop and the external ears are formed. Your baby's reproductive organs also develop,At the end of the third month, your baby is about 3-4 inches long and weighs about 1 ounce. -
month 5, 2nd trimester
Hair is beginning to grow on your baby's head, a soft fine hair, covers his or her shoulders, back, and temples. This hair protects your baby and is usually shed at the end of the baby's first week of life.
Your baby's skin is covered with a whitish coating called vernix caseosa. This substance, thought to protect baby's skin from long exposure to the amniotic fluid, By the end of the fifth month of pregnancy, your baby is about 10 inches long and weighs from 1/2 to 1 pound. -
month 7, 3rd trimester
fat begins to be deposited on your baby. Your baby is about 14 inches long and weighs from about two to four pounds,Your baby's hearing is fully developed and he or she changes position frequently and responds to stimuli, including sound, pain, and light. -
month 1, 1st trimester
The amniotic sac is a water-tight sac that forms around the fertilized egg. It helps cushion the growing embryo throughout pregnancy.The placenta also develops at this point in the first trimester.By the end of the first month of pregnancy, your baby is around 1/4in long - about the size of a grain of rice! -
month 2, 1st trimester
Each ear begins as a little fold of skin at the side of the head. Tiny buds that eventually grow into arms and legs are forming. Fingers, toes, and eyes are also forming in the second month of pregnancy.The neural tube is well formed. The digestive tract and sensory organs begin to develop. Bone starts to replace cartilage. The embryo begins to move, although the mother cannot yet feel it. By the end of the second month, your baby, is about 1 inch long, weighs about 1/3 ounce -
month 6, 2nd trimester
By the end of the sixth month, your baby is about 12 inches long and weighs about 2 pounds. His or her skin is reddish in color, wrinkled, and veins are visible through the baby's translucent skin. Baby's finger and toe prints are visible. The eyelids begin to part and the eyes open.Your baby may respond to sounds by moving or increasing the pulse, and you may notice jerking motions if baby hiccups. -
month 8, 3rd trimester
your baby, who is now about 18 inches long and weighs as much as about five pounds, it continues to mature and develop body fat reserves. You may notice that your baby is kicking more. Baby's brain is developing rapidly at this time, and he or she can see and hear. Most internal systems are well developed, but the lungs may still be immature. -
month 9, 3rd trimester
your baby continues to grow and mature. His or her lungs are nearly fully developed. Your baby's reflexes are coordinated so he or she can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light, and touch.
Your baby's position changes to prepare itself for labor and delivery. The baby drops down in your pelvis, and his or her head is facing down toward the birth canal.By the end of this month, your baby is about 18 to 20 in long and weighs about seven pounds. -
