There are two causes of thick fetal fat, one is the fetus’s own factor and the other is the pregnant woman’s factor. Fetal fat is a kind of fetal appendage, it may be due to the fetus’s own metabolism is more vigorous, the sebum secreted is more, and the combination of shedding skin cells, it will form fetal fat attached to the surface of the body. It may also be caused by maternal factors, mostly due to eating too much greasy food during pregnancy, which will be transported to the baby through the umbilical cord, thus leading to excess fetal fat. After the fetal fat itself has a certain protective effect on the skin, usually do not need special treatment, after birth will gradually disappear, but pay attention to skin cleaning.