4 weeks 5 weeks 6 weeks 7 weeks One Month Your baby is an embryo consisting of two layers of cells from which all her organs and body parts will develop. 4 weeks 5 weeks 6 weeks 7 weeks

Two Months Your baby is now about the size of a kidney bean and is constantly moving. He has distinct, slightly webbed fingers. 8 weeks 9 weeks 10 weeks 11 weeks 12 weeks

Three Months By now your baby is about 3 inches long and weighs nearly an ounce. Her tiny, unique fingerprints are now in place. 13 weeks 14 weeks 15 weeks 16 weeks

18 weeks Baby begins to hear 19 weeks Lanugo covers baby's skin Four Months Your baby is now about 5 inches long and weighs 5 ounces. His skeleton is starting to harden from rubbery cartilage to bone. 17 weeks Fat accumulates 18 weeks Baby begins to hear 19 weeks Lanugo covers baby's skin 20 weeks begun to feel your baby's movements.

Five Months Eyebrows and eyelids are now in place. Your baby would now be more than 10 inches long if you stretched out her legs. 21 weeks 22 weeks 23 weeks 24 weeks

Six Months Your baby weighs about a pound and a half. His wrinkled skin is starting to smooth out as he puts on baby fat. 25 weeks 26 weeks 27 weeks 28 weeks 29 weeks

Seven Months By now, your baby weighs about 3 pounds and is more than 15 inches long. She can open and close her eyes and follow a light. 30 weeks 31 weeks 32 weeks 33 weeks

Eight Months Your baby now weighs about 4 3/4 pounds. His layers of fat are filling him out, making him rounder, and his lungs are well developed. 34 weeks 35 weeks 36 weeks 37 weeks

Nine Months The average baby is more than 19 inches long and weighs nearly 7 pounds now, but babies vary widely in size at this stage 38 weeks 39 weeks 40 weeks 41 weeks