The normal value of the fetal cerebellar delayed cord pool at 24 weeks is usually no more than 10 mm, and within 10 mm is normal. If it exceeds 10mm be on high alert for conditions such as congenital hydrocephalus. When a baby suffers from hypoxia or malformation of brain development in the mother’s body, hydrocephalus is likely to occur, resulting in a high normal value of the medullary pool and thus a high degree of vigilance. Care should be taken to have the pregnant woman undergo regular medical checkups to follow up on the development of the medulla oblongata pool. If the medullary pool can recover to less than 10 mm before birth, there is usually no problem, but if the value of the medullary pool continues to grow, hydrocephalus is likely to have occurred and special measures should be taken to treat it, and the pregnancy may even need to be terminated. It is recommended that pregnant women should have ultrasound examinations every month or twice a month to closely observe the changes in the value of the medullary pool.