Fetal fat can be broadly divided into fetal factors and maternal factors, need to be specifically analyzed. 1. Fetal factors: rapid growth and development of the fetus, fast metabolism, sebaceous gland secretion, the fetus’s own secretion of oil and shedding of epidermal cells compounded together to form fetal fat. 2. maternal factors: the fetus mainly through the umbilical cord to obtain the nutrients in the amniotic fluid, if the pregnant woman during pregnancy intake of nutrients, resulting in excess nutrients, will prompt the fetus metabolism increase, resulting in the formation of fetal fetal sebum. Fetal fat for the baby’s skin has a certain maintenance role, generally do not need special treatment, normal bathing, usually 1 ~ 3 days will disappear, it is recommended that parents pay attention to the baby’s personal cleanliness and hygiene, pay attention to keep an eye on the baby with or without symptoms of discomfort, if there is discomfort, should be timely consultation.