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first trimester
The first trimester will span from conception to 12 weeks. This is generally the first three months of pregnancy. During this trimester, your baby will change from a small grouping of cells to a fetus that is starting to have a baby’s features. -
Month 1 (weeks 1 through 4)
As the fertilized egg grows, a water-tight sac forms around it, gradually filling with fluid. This is called the amniotic sac, and it helps cushion the growing embryo. During this time, the placenta also develops. The placenta is a round, flat organ that transfers nutrients from the mother to the baby, and transfers wastes from the baby. Think of the placenta as a food source for your baby throughout the pregnancy. -
Month 2 (weeks 5 through 8)
Your baby's facial features continue to develop. 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. The neural tube (brain, spinal cord and other neural tissue of the central nervous system) is well formed now. The digestive tract and sensory organs begin to develop too. Bone starts to replace cartilage. -
Month 3 (weeks 9 through 12)
Your baby's arms, hands, fingers, feet and toes are fully formed. At this stage, your baby is starting to explore a bit by doing things like opening and closing its fists and mouth. Fingernails and toenails are beginning to develop and the external ears are formed. The beginnings of teeth are forming under the gums. Your baby's reproductive organs also develop, but the baby's gender is difficult to to find on ultrasound. -
Second trimester
This middle section of pregnancy is often thought of as the best part of the experience. By this time, any morning sickness is probably gone and the discomfort of early pregnancy has faded. The baby will start to develop facial features during this month. You may also start to feel movement as your baby flips and turns in the uterus. During this trimester, many people find out the sex of the baby. This is typically done during an anatomy scan around 20 weeks -
Month 4 (weeks 13 through 16)
Your baby's heartbeat may now be audible through an instrument called a doppler. The fingers and toes are well-defined. Eyelids, eyebrows, eyelashes, nails and hair are formed. Teeth and bones become denser. Your baby can even suck his or her thumb, yawn, stretch and make faces By the end of the fourth month, your baby is about 6 inches long and weighs about 4 ounces. -
Month 5 (weeks 17 through 20)
At this stage, you may begin to feel your baby moving around. Your baby is developing muscles and exercising them. This first movement is called quickening and can feel like a flutter. Hair begins to grow on baby's head. Your baby's shoulders, back and temples are covered by a soft fine hair called lanugo. This hair protects your baby and is usually shed at the end of the baby's first week of life. -
Month 6 (weeks 21 through 24)
your baby's skin is reddish in color, wrinkled and veins are visible through the baby's skin. Baby's finger and toe prints are visible. In this stage, the eyelids begin to part and the eyes open. -
Month 7 (weeks 25 through 28)
Your baby will continue to mature and develop reserves of body fat. At this point, the baby's hearing is fully developed. The baby changes position frequently and responds to stimuli, including sound, pain and light. The amniotic fluid begins to diminish. If born prematurely, your baby would be likely to survive after the seventh month. At the end of the seventh month, your baby is about 14 inches long and weighs from 2 to 4 pounds. -
Third trimester
This is the final part of your pregnancy. You may be tempted to start the countdown till your due date and hope that it would come early, but each week of this final stage of development helps your baby prepare for childbirth. Throughout the third trimester, your baby will gain weight quickly, adding body fat that will help after birth. -
Month 8 (weeks 29 through 32)
Your baby will continue to mature and develop reserves of body fat. You may notice that your baby is kicking more. Baby's brain is developing rapidly at this time, and your baby can see and hear. Most internal systems are well developed, but the lungs may still be immature. Your baby is about 18 inches long and weighs as much as 5 pounds. -
Month 9 (weeks 33 through 36)
During this stage, your baby will continue to grow and mature. The lungs are close to being fully developed at this point. Your baby's reflexes are coordinated so he or she can blink, close the eyes, turn the head, grasp, and respond to sounds, light, and touch. Your baby is about 17 to 19 inches long and weighs from 5 ½ pounds to 6 ½ pounds. -
Month 10 (Weeks 37 through 40)
In this final month, you could go into labor at any time. You may notice that your baby moves less due to tight space. At this point, your baby’s position may have changed to prepare for birth. Ideally, the baby is head down in in your uterus. You may feel very uncomfortable in this final stretch of time as the baby drops down into your pelvis and prepares for birth. Your baby is about 18 to 20 inches long and weighs about 7 pounds.