About 1/4 inch. About 7/10.000 oz. Heart pulsates and pumps blood digestive system, back bone and spinal cord begin to form, small buds appear for arms and legs. Your baby is an embryo consisting of two layers of cells from which all her organs and body parts will develop.

About 1 1/8 inches. About 1/4 oz. Has a face, eyes, nose, legs and tongue; eyelids are fused. Brain has taken shape . Internal organs developing. Limbs begin to form arms, elbows, forearms, hands, thighs, knees, feet. Your baby is now about the size of a kidney bean and is constantly moving. He has distinct, slightly webbed fingers.

About 3 inches, 1 1/2 oz. Hands, fingers, legs, feet and toes are fully formed. Eyes almost fully developed, lids are still fused; tooth sockets & buds in the jaw bones form. Baby possesses most of its organs & tissues. Heartbeat can be detected with special instrument.By now your baby is around 7 to 8 centimeters (3 inches) long and weighs about the same as a pea pod. Her tiny, unique fingerprints are now in place.

About 6 1/2 to 7 inches about 7 oz. Muscles and bones are formed. Mother may feel movement. Heartbeat is strong. Skin is bright pink, transparent. Ears, eyes, nose, mouth take final appearance. Your baby is now about 13cm (5.5in) long and weighs 140g (5oz). His skeleton is starting to harden from rubbery cartilage to bone.

About 10 to 12 inches. About 1 lb. Internal organs maturing at a fast rate. Eyelids still fused. Eyebrows and hair on the head have appeared. Eyebrows and eyelids are now in place. Your baby would now be more than 27cm (10.5in) long if you stretched out her legs.

About 11 to 14 inches. About 1 3/4 lb. Skin still bright pink, wrinkled, covered with a heavy protective creamy coating. Eyelids separate, eyelashes form. Fingernails grow to ends of fingers.

About 14 to 17 inches. About 2 1/2 to 3 lb. Skin still wrinkled and red. All vital organs formed: further development is mainly in size.

About 16 1/2 to 18 inches. About 4 1/2 to 5 1/2 lb. Head bones are soft and flexible. Fat deposits under the skin eliminate wrinkling.

About 20 inches. About 7 1/4 to 7 1/2 lb. Skin covered with creamy coating; fine hair is gone. Baby is now fully developed and ready for life outside the womb.