When you lie down in the 4th month of pregnancy, you will find hard lumps in your abdomen, which is mainly caused by the uterus enlarging and pressing on the abdomen, which is usually a normal manifestation of pregnancy, and usually does not require special treatment. The reason for this is that in the fourth month of pregnancy, the development of the fetus will increase, and at the same time, the gradually enlarged fetus will compress the uterine wall, resulting in the uterus protruding, when lying down and touching the abdomen, hard lumps will appear, but in fact, just an enlarged fetus and the uterus. Treatment of pregnant women need to relax the mind, avoid anxiety, distraction and other emotions, so as not to cause uterine contraction, affecting the growth and development of the fetus. Daily can be more nutrition, appropriate activities to enhance physical fitness, but also pay attention to the hygiene and cleanliness of the vulva. Pregnant women should have regular obstetric checkups for Down’s syndrome, ultrasound, blood test, etc. to pay attention to the development of the fetus in time. Precautions during pregnancy may appear in the stomach appear hard, tight feeling, mostly normal physiological phenomenon, generally can be through the left side of the lying position, pay more attention to rest to ease the discomfort symptoms. If your stomach is swollen and hard during pregnancy, accompanied by vaginal bleeding or abdominal pain, you need to be alert to the possibility of miscarriage and go to the hospital in a timely manner to ensure the safety of the mother and baby.