Prenatal Devolpment How Your Baby Grows During Pregnancy Acog

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Changes During Pregnancy (Text Version)

Month one to two
Weeks 1 to 8
[Paradigm of an embryo in a uterus during the first or second month of pregnancy]

• The egg is fertilized by sperm and a growing brawl of cells chosen the blastocyst implants in the uterus.

• Week 5 begins the embryo stage of evolution.

• The brain and spine begin to course, followed past the neural tube.

• Cardiac tissue starts to develop.

• Parts of the face accept shape and the inner ear begins to develop.

• Arm and leg buds appear, and then webbed fingers and toes emerge.

• The long tube that will become the digestive tract takes shape.

By the cease of week viii, the embryo is about half an inch long.

Month iii
Weeks 9 to 12
[Epitome of a fetus in a uterus during the third month of pregnancy]

• Cartilage for the limbs, hands, and anxiety is forming only won't harden into bones for a few weeks.

• Eyelids class but remain closed.

• The head develops a rounded shape.

• Week 11 begins the fetus stage of development.

• The fetus makes breathing-similar movements and swallows amniotic fluid.

• The kidneys are making urine, the pancreas is making insulin, and fingernails have formed.

By the finish of week 12, the fetus is about 2 inches long and weighs about half an ounce.

Month iv
Weeks 13 to 16
[Epitome of a fetus in a uterus during the fourth calendar month of pregnancy]

• By week xiii, all major organs have formed and will continue to develop.

• Basic are hardening, peculiarly the long bones.

• The pare is thin and see-through but volition start to thicken soon.

• At week 14, the neck is defined, and the lower limbs are adult.

• The fetus's hearing begins to develop.

• The lungs begin to form tissue that will allow them to substitution oxygen and carbon dioxide after birth.

• Limb movements become more coordinated.

By the end of calendar week 16, the fetus is more than 4 inches long and weighs more 3 ounces.

Month 5
Weeks 17 to 20
[Image of a fetus in a uterus during the fifth calendar month of pregnancy]

• The fetus is more than active now, and cardiac activity may be seen on an ultrasound exam.

• At week 18, the fetus can hear sounds.

• The part of the brain that controls motor movements is fully formed.

• The digestive system is working.

• At week 19, the ears, nose, and lips may exist recognizable on an ultrasound test.

• Soft, downy pilus called lanugo is starting to form all over the body.

Past the terminate of week xx, the fetus is more 6 inches long and weighs less than xi ounces.

Calendar month 6
Weeks 21 to 24
[Prototype of a fetus in a uterus during the sixth month of pregnancy]

• The fetus's kicks and turns are stronger at present.

• If the hand floats to the mouth, the fetus may suck its thumb.

• Eyebrows are visible.

• At week 23, near of the fetus'due south sleep time is spent in rapid middle movement (REM) slumber.

• Ridges are forming in the hands and feet that later volition be fingerprints and footprints.

• The lungs continue to develop.

By the end of week 24, the fetus is about 12 inches long and weighs well-nigh 1½ pounds.

Calendar month 7
Weeks 25 to 28
[Paradigm of a fetus in a uterus during the seventh month of pregnancy]

• The fetus tin can respond with movement to familiar sounds, such as your voice.

• The lungs are now fully formed just not however set to office outside the uterus.

• Loud sounds may make the fetus respond by pulling in artillery and legs.

• The lungs begin making surfactant, a substance needed for breathing after birth.

• At 27 weeks, more fat is existence added to go along the fetus warm.

• A greasy cloth chosen vernix has started to develop. Vernix acts as a waterproof barrier that protects the skin.

By the end of week 28, the fetus is nearly 15 inches long and weighs about 2½ pounds.

Month 8
Weeks 29 to 32
[Image of a fetus in a uterus during the eighth month of pregnancy]

• The fetus can stretch, kicking, and make grasping motions.

• The eyes tin open up and close and sense changes in light.

• The bone marrow is forming red blood cells.

• At week 31, major evolution is finished, and the fetus is gaining weight very speedily.

• In boys, the testicles have begun to descend into the scrotum.

• At week 32, the fine pilus that covered the fetus'south body (lanugo) begins to disappear.

Past the terminate of week 32, the fetus is well-nigh 17 inches long and weighs a little more than than iv pounds.

Calendar month ix
Weeks 33 to 36
[Paradigm of a fetus in a uterus during the ninth month of pregnancy]

• The brain is growing and developing rapidly.

• The bones harden, merely the skull remains soft and flexible.

• More fat is forming nether the peel.

• The fingernails have grown to the ends of the fingers.

• During week 36 or 37, most fetuses plough to a head-down position for nascence.

By the cease of week 36, the fetus is almost 18 inches long and weighs a little more 6 pounds.

Month x
Weeks 37 to 40
[Image of a fetus in a uterus during the tenth month of pregnancy]

• The lungs, encephalon, and nervous arrangement go on to develop.

• The circulatory system is complete, and so is the musculoskeletal system.

• The fetus is taking up a lot of space in the amniotic sac and yous should proceed to experience movement.

• By now, the fetus's caput may have dropped lower into position in your pelvis.

Past the cease of calendar week 40, the fetus is 20 inches long and may weigh seven½ to 8 pounds.

How the Uterus Grows During Pregnancy

The size of your uterus can help prove how long you take been pregnant. The uterus fits inside the pelvis until week 12. By week 36, the top of the uterus is under your rib muzzle.

[A pregnant adult female is shown with dotted lines on her abdomen to marking how the uterus grows during pregnancy. Each line marks four weeks of pregnancy, from week 12 to week 40. The lines motility from the lesser of her abdomen to the top of her abdomen.]

Changes In Your Body

The Starting time Trimester

• Your period stops.

• Your breasts may become larger and more tender.

• Your nipples may stick out more.

• You may need to urinate more often.

• You may feel very tired.

• You may feel nauseated and may vomit.

• You may require certain foods or lose your appetite.

• You may accept heartburn or indigestion.

• Yous may feel bloated and have excess gas.

• Yous may be constipated.

• You may gain or lose a few pounds.

The 2d Trimester

• Your ambition increases and nausea and fatigue may ease.

• Your belly begins to expand. By the end of this trimester, the elevation of your uterus will be nearly your rib cage.

• You lot will begin to experience the fetus move.

• The skin on your abdomen stretches and may feel tight and itchy. You may run into stretch marks.

• Your abdomen may ache on one side or the other as the ligaments that support your uterus are stretched.

• You may get brown patches, called the "mask of pregnancy," on your face.

• Your areolas, the darker skin effectually your nipples, may darken.

• Your feet and ankles may swell.

The 3rd Trimester

• You can feel the fetus's movements strongly.

• You may be short of breath.

• You may need to urinate more ofttimes equally the fetus drops and puts extra pressure on your bladder.

• Colostrum—a yellowish, watery premilk—may leak from your nipples.

• Your navel may stick out.

• You may have contractions (intestinal tightening or pain). These tin betoken false or real labor.

PFSI026: This data is designed equally an educational assistance to patients and sets forth current information and opinions related to women'due south wellness. It is not intended as a statement of the standard of care, nor does it contain all proper treatments or methods of care. It is not a substitute for a treating clinician's contained professional person judgment. For ACOG's complete disclaimer, visit www.acog.org/WomensHealth-Disclaimer.

Copyright October 2020 past the American Higher of Obstetricians and Gynecologists. All rights reserved. No part of this publication may be reproduced, stored in a retrieval organization, posted on the net, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher.

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Source: https://www.acog.org/womens-health/infographics/changes-during-pregnancy

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