What Has Formed in the Baby at the End of the First Trimester
Fetal Development by Trimester
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From the time of formulation, your baby volition grow and change inside your uterus until he or she is born. Each trimester has a unique set of milestones. In the first trimester, your baby will abound from a fertilized egg into a moving fetus with eyes, ears, and working organs. In the 2d trimester, your baby's features develop and yous may be able to feel your baby move. In the third trimester, your baby will abound apace to get ready for birth.
Your physician volition calculate your estimated due date during your beginning prenatal care visit. It will exist about twoscore weeks from the commencement day of your terminal menstrual menstruation. Fifty-fifty though your baby is not conceived until about 2 weeks after you outset your period, week 1 of your pregnancy is considered to be the week of your menstrual period.
Your first trimester lasts until the end of week 12. The second trimester lasts from week 13 to the end of week 26. Your third trimester is from week 27 until birth. Most babies are born between weeks 38 and 42.
First Trimester Evolution
Your baby is conceived when a sperm prison cell penetrates the egg. This happens around the end of week 2 of your pregnancy. It is at this moment that your baby's sex is determined. This depends on whether the sperm prison cell was carrying an 10 chromosome (a baby girl) or a Y chromosome (a baby boy).
| Fertilization |
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The fertilized egg cell begins to divide soon after conception. The egg is made upwardly of hundreds of cells past week 3. Information technology has now moved downwardly the fallopian tube and implanted itself into the lining of your uterus. Every bit your baby continues to grow, it becomes an embryo. An embryo is made up of 3 tissue layers. The inner layer will exist your baby'southward lungs, liver, and digestive system. The heart layer will become your infant's basic, kidneys, sex organs, and heart. The outer layer will brand up your infant's skin, pilus, eyes, and nervous system.
The spinal cord, brain, heart, and lungs grow and develop rapidly during the starting time trimester. In addition, the mouth, nose, eyes, ears, toes, and fingers begin to grade. Your baby'due south center will begin to beat around week 6. It sometimes cannot exist heard until effectually week 10-12. The umbilical cord, which serves to nourish your baby and dispose of his or her wastes throughout the pregnancy, is formed during the kickoff trimester.
| Nine (nine) Week Old Fetus in Utero |
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Your infant's digestive organisation and reproductive arrangement develops during the first trimester. Every bit his or her muscles proceed to course in calendar week ix, your infant may begin to move, but you cannot feel these movements yet.
By the end of your showtime trimester, your baby will be most three inches long and counterbalance ½ an ounce.
Second Trimester Development
In the second trimester, your babe'due south hair, including eyebrows and eyelashes, begins to grow. Muscles and basic go along to develop, allowing more movement. If your baby is a girl, her eggs volition develop in her ovaries early in the second trimester. By most week xviii, your baby tin can hear your heartbeat and may fifty-fifty be startled by loud noises.
| Sixteen (16) Week Old Fetus in Utero |
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Your baby volition grow quickly in the second trimester. Y'all will be able to feel this. Information technology will put pressure on your lungs, tum, bladder, and kidneys. You may begin to feel your baby move during the 5th month. By the end of the 2d trimester, you will be able to experience that your babe has resting and alert periods. Every bit a result of the development of taste buds and sensory neurons, your infant will be able to taste and bear on during the second trimester.
Past the stop of week 23, your baby probably weighs most a pound. Babies born this early may be able to survive with the assist of good medical care, but they commonly have mental and physical disabilities.
Your baby'southward eyes are sealed shut until the end of the second trimester when your infant starts to blink. By the terminate of the second trimester, your baby volition weigh almost 2 pounds and will exist well-nigh 1 foot long. By at present, all of the essential organs accept formed.
| Twenty-four (24) Week Erstwhile Fetus in Utero |
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| © Nucleus Medical Media, Inc. |
Third Trimester Development
Early on in your third trimester, your infant may begin to recognize the audio of your and your partner's voices. There will exist a lot of moving during the third trimester. Yous should be able to feel about x movements per hour. Babies begin "practicing" breathing during the third trimester by moving their diaphragm. You lot may find that your baby gets the hiccups from fourth dimension to time.
| 20 Viii (28) Week Old Fetus in Utero |
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| © Nucleus Medical Media, Inc. |
During the final few weeks before birth, your babe volition gain a practiced bargain of his or her weight. Past week 33, your baby is in position for delivery, ideally with his or her head resting on your cervix. The bones harden and the skin becomes thicker. Past 34 weeks, your babe would exist able to survive outside of your womb without extensive medical intervention, although oxygen therapy may be needed.
Get-go at week 35, your baby volition grow rapidly, gaining 1/2 -3/4 pound per calendar week. Babies are considered to accept grown to "full-term" by week 37. Just, your baby volition continue to grow and gain weight, and will most oft exist delivered between weeks 38 and 42. Your baby will weigh an average of vii.5 pounds at nascency and mensurate almost xx-22 inches long.
A pregnancy that goes beyond 42 weeks is considered past the due date. At this time, the doc may induce labor. If your pregnancy has gone across 40 weeks, be certain to talk to your medico.
Resource
Office on Women's Health
https://www.womenshealth.gov
The American Congress of Obstetricians and Gynecologists
http://www.acog.org
Canadian Resource
The Club of Obstetricians and Gynaecologists of Canada
https://sogc.org
Women'due south Wellness Matters
http://www.womenshealthmatters.ca
References
Pregnancy: Stages of pregnancy. Part on Women's Wellness website. Bachelor at:https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/stages-pregnancy. Accessed Jan 29, 2021.
Pregnancy calendar. Nemours Foundation website. Bachelor at: http://kidshealth.org/en/parents/pregnancy-center/pregnancy-calendar. Accessed January 29, 2021.
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Source: https://www.winchesterhospital.org/health-library/article?id=101070
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