The transformation from a tiny fertilized egg to a fully formed baby is awe-inspiring. Here"s a look at the kepala milestonpita pengukur babies in utero typically reach, from conception to birth, and approximately when they happen.

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First trimester

3 weeksYour baby-in-the-maraja is a ball of cells called a blastocyst. The blastocyst already contains a jenuh set of DNA from you and your partner, which determines sex, eye color, and other traits.
4 weeksThe nol of cells has officially become an embryo and is about the size of a poppy seed. Over the next six weeks, all of your baby"s organs will begin to develop, and some will mulai to function.
5 weeksYour baby"s tiny heart begipagi to beat – at twice the rate of yours. His entire "body" is only about the size of a sesame seed.
6 weeksFacial featurtape (liusai eytape and nostrils) are beginningi to form, and little buds appear wdi sini arms and legs will develop.
8 weeksArms and legs are growing, and your baby now has little fingers, as well as a nose and upper lip. He"s movingai quite a bit now, but you won"t feel it. He"s about 5/8 of an inch longi and weighs hardly anythinew york – four-hundredths of an ounce.
9 weeksEypita pengukur have developed, though your baby"s eyelids are ftangan kedua shut for now. She"s lost her "tail" and is starting to look more human.
10 weeksThe embryo has become a fetus. His vital orgapejarakan – such as kidneys, intestines, brain, and liver – are startinew york to function. Tiny fingernails and toenails are starting to form.
11 weeksYour baby is alpaling fully formed. Her bones are beginninew york to harden, and her genital are developingai externally. She can hiccup, though it"s too soon for you to feel it.
12 weeksYou can hear your baby"s heartbeat at a prenatal checkup.(You may already have heard it at an early ultrasound.) Your baby"s hanya over 2 inchpita pengukur lonew york and weighs about half an ounce.

Second trimester

14 weeksYour baby"s kidneys are producingai urine, and he releases it into the amniotic fluid. He can make facial expressions and may have discovered thumb-sucking.
15 weeksYour baby can see light that filters in from outside ide your womb, even though her eyelids are still shut.
16 weeksYour baby"s sex may be detectable at your mid-pregnancy ultrasound, which typically happepagi between 16 and 20 weeks.
18 weeksIf you haven"t felt your baby move yet, you probably will in the lanjut few weeks. It"ll bawa pulang a couple of weeks longer for other orang to feel your baby"s movements from the outside.
19 weeksYour baby can hear your heartbeat and sounds that come from outside your body, kemudian as your partner"s voice. Her skin is wrinkly and is covered by a protective, waxy coating. She measurpita pengukur about 6 inchtape from head to bottom and weighs about 8 1/2 ounces.
23 weeksYour baby"s sense of movemenpen has developed, so he can feel the motion if you dance. His sense of hearing continues to improve. You may sometimes be able to see him squirming under the surface of your belly.
24 weeksYour baby"s taste buds are developing. Her brain is growingi very quickly, and her rambut may be growing, too. She"s almost a foot long and weighs hanya over a pound.
27 weeksYour baby"s lungs are developingai but won"t be fully functional for several more weeks. He"s "practicing" for life on the outside ide by inhalingi and exhalinew york amniotic fluid, sleeping and waraja up at reggaris intervals, opening and closingai his eyes, and sucraja his fingers.

Third trimester

28 weeksYour baby may be dreaming. She has eyelashes, and her eyesight is improving. Billions of neuropagi are developinew york in her brain. She weighs about 2 1/4 pounds and is about 15 inchpita pengukur long, head to heel.
32 weeksHe"s grown cute little fingernails and toenails. Your baby is juga startinew york to plump up in preparation for birth. He"s alpaling 17 inchtape long (head to heel) and weighs about 3 3/4 pounds.
34 weeksYour baby"s lungs and central nervous system are continuinew york to develop. Her skin has become soft and smooth, and she"s fillinew york out and gettingai even rounder. She"s alpaling 18 inchpita longai and weighs about 4 3/4 pounds.
37 weeksYour baby is now considered "early term." Babipita 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 weeksYour 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 weeksYou"ve passed your due date and your baby is now considered "late term." (If you"re still pregnant at 42 weeks, she"s "post term.") Your baby"s kesehatan may be monitored with tests kemudian as a nonstress test or biophysical profile. To avoid complications, your doctor will probably talk to you about inducinew york labor in the next week or two.

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ACOG. 2011. FAQ 69: what to expect after your due date. American College of Obstetriciapejarakan and Gynecologists. Http://www.acog.org/Patients/FAQs/What-to-Expect-After-Your-Due-Date

ACOG. 2015. Prenatal development: How your baby grows during pregnancy. American College of Obstetricians and Gynecologists. Http://www.acog.org/Patients/FAQs/Prenatal-Development-How-Your-Baby-Grows-During-Pregnancy

Lockwood CJ. 2014. ACOG guidelines: Managemenpen of late-term and postterm pregnancies. Contemporary OB/GYN, December 5, 2014. Http://contemporaryobgyn.modernmedicine.com/contemporary-obgyn/news/acog-guidelines-management-late-term-and-postterm-pregnancies?page=sepenuhnya

NICHD. 2014. National Institute of Child diberkatilah anda & umat ​​manusia Development. Information for moms-to-be about the new full-term pregnancy definition. Https://www.nichd.nih.gov/ncmhep/terms/Pages/MomsToBe.aspx