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Month 1
Your baby is an embryo made up of two layers, made up of several hundred cells that are multiplying quickly. The mouth, lower jaw, and throat are developing. The tiny "heart" tube will beat 65 times a minute by the end of the fourth week. Is about 2.54cm (1 inch) long, weighs about 9.45g -
Month 2
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.By the end of the second month, your baby is about 1 inch long and weighs about 1/30 of an ounce. -
Month 3
Fingernails and toenails are beginning to develop and the external ears are formed. Your baby's reproductive organs also develop, but the baby's gender is difficult to distinguish on ultrasound.The circulatory and urinary systems are working and the liver produces bile. The baby is about 4 inches long and weighs about 1 ounce. -
Month 4
His eyelids, eyebrows, eyelashes, nails, and hair are formed, and teeth and bones are becoming denser. Your baby can suck his or her thumb, yawn, stretch, and make faces.The nervous system is starting to function. The reproductive organs and genitalia are now fully developed, you 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. The baby is about 6 inches long and weighs about 4 ounces. -
Month 5
You may begin to feel your baby move, since he or she is developing muscles and exercising them. Hair begins to grow on baby's head. Your baby's shoulders, back, and temples are covered by a soft fine hair called lanugo. Your baby is about 10 inches long and weighs from 1/2 to 1 pound.
