After three months of pregnancy, the baby has begun to develop all organs, so the baby's body will gradually become bigger. The most direct reflection of mother's stomach is getting higher and higher. If you are pregnant for three months and have a big belly, you can consider whether you are twins. So why are you pregnant for three months?

Why is the stomach big after three months of pregnancy? Pregnant women are pregnant for three months, and their stomachs will not be big. If the pregnant woman is thin, it is basically invisible. If you want to show your belly, it usually takes four months to see it.

In the third month of pregnancy, the fetus is about 2-9 cm long and weighs about 9-23 grams. The baby's eyes, fingers and toes can be clearly distinguished, the limbs can move freely in amniotic fluid, and the left leg and right leg can flex and stretch alternately. A baby is not called a fetus until the third month. From the eighth week, the fetal head accounts for 1/2 of the total fetal length, then the growth accelerates, and the weight doubles by the twelfth weekend. At this point, the fetal visceral system has begun to operate, swallowing amniotic fluid and excreting urine. At the end of 12 weeks, the vulva morphology of mature fetus was displayed.

After three months of pregnancy, the pregnant woman's abdomen gradually bulges, and the pregnancy characteristics become more and more obvious. Let's learn about the physical changes of pregnant women after three months of pregnancy. The painful vomiting during pregnancy gradually disappears because the placenta replaces the production of hormones. In two weeks or less, pregnant women will not feel sick. Pregnant women's breasts are expanding rapidly. Due to the rupture of elastic fibers under the abdomen and breast, deep red stretch marks appear in these areas. Some pregnant women also have stretch marks on their hips and waist.

What are the prenatal examinations in the third trimester? Every prenatal examination during pregnancy requires some prenatal examinations, such as measuring height, weight and blood pressure. Through these tests, it can be estimated whether the weight gain of pregnant women is normal, and through these tests, the overall physical condition of pregnant women can be evaluated.

Prenatal examination in the third trimester of pregnancy includes fetal heart rate examination. By listening to the fetal heart rate, we can judge whether the fetus is alive or not. The normal fetal heart rate is 120- 160 times per minute. At the same time, you can also check the fetal size by B-ultrasound and calculate the expected date of delivery. These results can be used as a reference for later prenatal examination.

In the third month of pregnancy, pregnant women also need to do a series of laboratory tests such as blood routine, urine routine, renal function and liver function to determine whether pregnant women have anemia, hepatitis, nephritis and other diseases that affect the health of pregnant women and their fetuses. It is necessary to do ECG examination during the prenatal examination to see if the pregnant woman's heart function is sound.

In the third trimester, we should also check syphilis, hepatitis B, AIDS and other infectious diseases to ensure that the fetus can be born healthily.

What tests do you need to do for three months of pregnancy? According to obstetricians, the vast majority of normal pregnant women after the first check-up (the first check-up during pregnancy) every 4 weeks 1 time, every 2 weeks 1 time after 28 weeks, and every week 1 time after 36 weeks until delivery.

There are still three months of pregnancy, so you must do prenatal registration and initial prenatal examination within this month and get the maternal and child health care manual. Choose a trustworthy hospital as a prenatal examination and delivery hospital.