-
3 weeks
the baby in a making cell ball. -
9 weeks
Eyes have developed, the baby lost the "tail" and is starting to look more human. -
11 weeks
Your baby is almost fully formed. Baby's bones are beginning to harden, and the genitalia are developing externally. -
10 weeks
The embryo has become a fetus. His vital organs are starting to function. Tiny fingernails and toenails are starting to form. -
4 weeks
the cell ball become an embryo. -
7 weeks
the brain is growing at a rapid rate. -
6 weeks
Facial features are beginning to form, and little buds appear on arms and legs -
8 weeks
Arms and legs are growing, and the baby has little fingers, as well as a nose and upper lip. -
5 weeks
baby's heart begins to beat, and only a size of a sesame seed. -
Period: to
First trimester
Week 1-week 12 -
12 weeks
You can hear your baby's heartbeat at a prenatal checkup. The brain enlarges very little as compared to its birth size and shape. Your baby's just over 2 inches long and weighs about half an ounce. -
14 weeks
Your baby's kidneys are producing urine, and he releases it into the amniotic fluid. He can make facial expressions -
Period: to
Second trimester
Week 3-week 28 -
15 weeks
Your baby can see light that filters in from outside your womb, even though her eyelids are still shut. -
19 weeks
Your baby can hear your heartbeat and sounds that come from outside your body. The skin is wrinkly and is covered by a protective, waxy coating. The brain becomes capable of forming millions of motor neurons. -
23 weeks
Your baby's sense of movement has developed. His sense of hearing continues to improve. -
24 weeks
Your baby's taste buds are developing. Her brain is growing very quickly and starts to regulate all body functions. The baby almost a foot long and weighs just over a pound. -
27 weeks
Your baby's lungs are developing and the brain is actively processing many senses. -
28 weeks
Your baby may be dreaming. The baby has eyelashes, and the eyesight is improving. Billions of neurons are developing in the brain. Baby's weighs about 2 1/4 pounds and is about 15 inches long. -
29 weeks
the brain continues to grow and increase rapidly in size until the 41 weeks. -
32 weeks
He's grown cute little fingernails and toenails. He's almost 17 inches long and weighs about 3 3/4 pounds. -
Period: to
Third trimester
Week 29-week 41 -
34 weeks
Your baby's lungs and central nervous system are continuing to develop. Her skin has become soft and smooth. Baby is almost 18 inches long and weighs about 4 3/4 pounds. -
37 weeks
Your baby is now considered "early term." Babies born now usually do well, but ideally he'll stay in your womb for a couple more weeks to give his brain and lungs time to fully mature. -
39 weeks
Your baby is now considered full-term and is ready for life outside the womb. The average weight of a newborn is about 7 1/2 pounds, and the average length is about 20 inches. -
41 weeks
You've passed your due date and your baby is now considered "late term."