No weight gain in the 4th month of pregnancy is normal in most cases, and ultrasound is needed to assess the development of the fetus.
Before the fourth month of pregnancy, embryonic development is very slow, some pregnant women have early pregnancy nausea, vomiting, eating less may appear weight gain phenomenon, ultrasound examination of fetal development is normal that is not a problem.
Just pregnant, embryonic development is relatively slow, this time the fetal nervous system began to develop, the organs are in the stage of differentiation, so pregnant women weight gain is not very obvious.
In early pregnancy, some pregnant women experience nausea, vomiting, and eat less, which may also lead to no weight gain. Prenatal examination of fetal development in line with the normal size, pregnant women have no abnormalities, is normal. After 4 months of pregnancy, the fetus develops faster, and pregnant women need to pay attention to nutritional supply.