By the End of the First Trimester, Most Babies Weigh

Stages of pregnancy

Pregnancy lasts almost 40 weeks, counting from the outset day of your final normal catamenia. The weeks are grouped into 3 trimesters.(TREYE-mess-turs) Find out what's happening with you and your baby in these iii stages.

First trimester (calendar week 1–week 12)

During the beginning trimester your body undergoes many changes. Hormonal changes impact nearly every organ organization in your torso. These changes can trigger symptoms even in the very start weeks of pregnancy. Your period stopping is a articulate sign that you are pregnant. Other changes may include:

• Extreme tiredness
• Tender, swollen breasts. Your nipples might besides stick out.
• Upset stomach with or without throwing upwardly (morning sickness)
• Cravings or distaste for certain foods
• Mood swings
• Constipation (problem having bowel movements)
• Need to pass urine more ofttimes
• Headache
• Heartburn
• Weight gain or loss

Every bit your body changes, y'all might need to make changes to your daily routine, such equally going to bed before or eating frequent, small meals. Fortunately, most of these discomforts volition go away as your pregnancy progresses. And some women might not feel any discomfort at all! If you have been pregnant earlier, you might feel differently this time around. Just as each adult female is different, and then is each pregnancy.

Second trimester (week 13–calendar week 28)

Most women find the 2nd trimester of pregnancy easier than the commencement. Just it is but every bit of import to stay informed most your pregnancy during these months.

You might notice that symptoms like nausea and fatigue are going away. Simply other new, more noticeable changes to your body are now happening. Your abdomen will aggrandize as the baby continues to grow. And before this trimester is over, you lot volition feel your baby beginning to move!

Every bit your body changes to make room for your growing infant, you lot may have:

• Torso aches, such as dorsum, abdomen, groin, or thigh pain
• Stretch marks on your belly, breasts, thighs, or buttocks
• Darkening of the pare effectually your nipples
• A line on the skin running from abdomen push button to pubic hairline
• Patches of darker skin, usually over the cheeks, forehead, nose, or upper lip. Patches often friction match on both sides of the face. This is sometimes called the mask of pregnancy.
• Numb or tingling hands, chosen carpal tunnel syndrome
• Itching on the abdomen, palms, and soles of the anxiety. (Call your doctor if yous accept nausea, loss of appetite, airsickness, jaundice or fatigue combined with itching. These can be signs of a serious liver problem.)
• Swelling of the ankles, fingers, and face. (If you notice any sudden or farthermost swelling or if you lot proceeds a lot of weight really quickly, call your doctor right away. This could be a sign of preeclampsia.)

Tertiary trimester (week 29–calendar week 40)

Y'all're in the home stretch! Some of the same discomforts you had in your second trimester will continue. Plus, many women find breathing difficult and notice they take to go to the bathroom even more often. This is because the infant is getting bigger and information technology is putting more pressure on your organs. Don't worry, your infant is fine and these issues will lessen once yous requite nativity.

Some new body changes you lot might notice in the third trimester include:

• Shortness of breath
• Heartburn
• Swelling of the ankles, fingers, and face. (If you notice whatsoever sudden or extreme swelling or if you gain a lot of weight really chop-chop, call your doctor right away. This could exist a sign of preeclampsia.)
• Hemorrhoids
• Tender breasts, which may leak a watery pre-milk chosen colostrum (kuh-LOSS-struhm)
• Your belly button may stick out
• Trouble sleeping
• The baby "dropping", or moving lower in your belly
• Contractions, which tin be a sign of real or false labor

Equally you almost your due date, your neck becomes thinner and softer (called effacing). This is a normal, natural process that helps the birth culvert (vagina) to open up during the birthing process. Your dr. will check your progress with a vaginal exam equally you lot nigh your due date. Go excited — the last inaugural has begun!

Your developing baby

Get-go trimester (week i-calendar week 12)

At 4 to 5 weeks:

• Your baby'southward brain and spinal cord have begun to class.
• The heart begins to form.
• Arm and leg buds appear.
• Your baby is at present an embryo and ane-twenty-5th inch long.

At 8 weeks:

• All major organs and external trunk structures accept begun to form.
• Your baby'due south heart beats with a regular rhythm.
• The artillery and legs abound longer, and fingers and toes have begun to course.
• The sex organs begin to form.
• The optics have moved forward on the face and eyelids take formed.
• The umbilical string is clearly visible.
• At the end of 8 weeks, your baby is a fetus and looks more like a human. Your baby is nigh 1 inch long and weighs less than one-8th ounce.

At 12 weeks:

• The nerves and muscles begin to piece of work together. Your baby can make a fist.
• The external sex activity organs show if your infant is a boy or daughter. A woman who has an ultrasound in the second trimester or later might exist able to find out the baby'southward sex.
• Eyelids close to protect the developing eyes. They will not open up again until the 28th week.
• Head growth has slowed, and your babe is much longer. Now, at about 3 inches long, your baby weighs almost an ounce.

Second trimester (week 13-week 28)

At 16 weeks:

• Musculus tissue and bone continue to class, creating a more complete skeleton.
• Skin begins to form. You can virtually run into through information technology.
• Meconium (mih-KOH-nee-uhm) develops in your baby'south intestinal tract. This will exist your babe's showtime bowel move.
• Your baby makes sucking motions with the oral cavity (sucking reflex).
• Your baby reaches a length of almost 4 to 5 inches and weighs almost 3 ounces.

At 20 weeks:

• Your baby is more than active. Yous might feel slight fluttering.
• Your baby is covered by fine, downy hair chosen lanugo (luh-NOO-goh) and a waxy coating called vernix. This protects the forming skin underneath.
• Eyebrows, eyelashes, fingernails, and toenails accept formed. Your infant tin even scratch itself.
• Your infant can hear and swallow.
• At present halfway through your pregnancy, your baby is about 6 inches long and weighs about nine ounces.

At 24 weeks:

• Os marrow begins to make blood cells.
• Taste buds class on your baby's tongue.
• Footprints and fingerprints accept formed.
• Real hair begins to grow on your baby's head.
• The lungs are formed, merely do non work.
• The hand and startle reflex develop.
• Your baby sleeps and wakes regularly.
• If your baby is a boy, his testicles begin to move from the abdomen into the scrotum. If your baby is a girl, her uterus and ovaries are in identify, and a lifetime supply of eggs accept formed in the ovaries.
• Your baby stores fat and has gained quite a bit of weight. Now at about 12 inches long, your infant weighs about 1½ pounds.

3rd trimester (calendar week 29-week forty)

At 32 weeks:

• Your baby's bones are fully formed, but still soft.
• Your baby'south kicks and jabs are forceful.
• The optics can open up and close and sense changes in light.
• Lungs are not fully formed, simply practice "breathing" movements occur.
• Your infant's body begins to store vital minerals, such as atomic number 26 and calcium.
• Lanugo begins to fall off.
• Your baby is gaining weight quickly, about one-half pound a week. Now, your babe is well-nigh xv to 17 inches long and weighs about 4 to 4½ pounds.

At 36 weeks:

• The protective waxy coating called vernix gets thicker.
• Body fat increases. Your baby is getting bigger and bigger and has less space to motility around. Movements are less forceful, but y'all will feel stretches and wiggles.
• Your babe is almost sixteen to 19 inches long and weighs about half-dozen to vi½ pounds.

Weeks 37–xl:

• At 39 weeks, your babe is considered full-term. Your baby's organs are ready to function on their own.
• Every bit you about your due date, your baby may plough into a caput-downward position for nascence. Most babies "nowadays" head downward.
• At birth, your babe may weigh somewhere between six pounds two ounces and 9 pounds 2 ounces and be 19 to 21 inches long. About full-term babies fall within these ranges. But healthy babies come in many different sizes.

All fabric contained on these pages are free of copyright restrictions and may be copied, reproduced, or duplicated without permission of the Office on Women'due south Health in the U.S. Department of Health and Human Services. Commendation of the source is appreciated.

Folio last updated: April eighteen, 2019

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Source: https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/stages-pregnancy

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