The best time to absorb the widening of the lateral ventricles is around 28-32 weeks of gestation, i.e., 30 weeks. The widening of the lateral ventricles is caused by the production of fetal cerebrospinal fluid at a rate higher than the circulation capacity of the midbrain aqueducts, and this condition will gradually disappear with the development of the intracerebral aqueduct system. If the internal diameter of the lateral ventricle is less than 1 cm, it usually has little effect; if the internal diameter of the lateral ventricle is greater than 1 cm, it is considered to be a widening of the lateral ventricle; if the internal diameter of the lateral ventricle is greater than 1.5 cm, it can be diagnosed as hydrocephalus. In fetuses with widened lateral ventricles, the absorption usually increases gradually around 28-32 weeks, and in some fetuses, the absorption is later and can be after 32 weeks. Under normal circumstances, most fetuses can absorb on their own, and only a small percentage will develop hydrocephalus. Therefore, pregnant women are advised to review the ultrasound regularly, strengthen nutrition and pay attention to more rest. During pregnancy, especially at 20 weeks-26 weeks, pregnant women need to have fetal screening for 4D malformations to clarify the fetal condition early. Meanwhile, fetuses with widened lateral ventricles need regular follow-up ultrasound, and if the condition progresses to hydrocephalus, termination of pregnancy should be considered.