There are more reasons for 10-month-old children to urinate less, mainly including the following: 1, caused by insufficient volume: causes of insufficient volume mainly include vomiting, diarrhea, eating less milk, drinking less water, sweating more, etc., as long as enough water is replenished, urine volume can increase significantly; 2, other causes: need to carefully observe whether combined with other symptoms, if there is obvious hematuria, need to consider whether there are stones, nephritis; if there is If edema is present, it is necessary to consider whether there is kidney disease; if foam is present in the urine, it is necessary to pay attention to whether there is proteinuria, and routine urine, kidney function, ureter of both kidneys and ultrasound of the bladder can be performed to clarify the cause of oliguria. It is difficult to measure the amount of urine in infants, and the amount of urine can be roughly estimated by weighing the diapers. 10-month-old children have individual differences in daily urine output, and there is no clear data, so a comprehensive judgment is needed based on the amount of water and milk the infant drinks, which can be compared with previous conditions. Whatever the case may be, infants who urinate less than 200mL per day are said to be oliguric, which is a more serious condition and requires prompt medical attention.