For infants with hydronephrosis, the following measures can be adopted: first, observation and waiting are needed. In some infants, the hydronephrosis is temporary, with the improvement of growth and development, the renal function of infants will be improved, and the hydronephrosis can be absorbed by themselves. If the hydronephrosis is not serious and there is no trend of progressive aggravation, only dynamic ultrasound review is needed at this time. Secondly, the infant should be given timely surgical treatment. If the infant’s hydronephrosis is very serious, causing the compression of renal tissue, causing renal function damage, or even no urine. At this time, it is necessary to give the infant timely surgical treatment to prevent the infant from irreversible damage of kidney function.