What causes frequent urination in newborns?

Patient's question:

Excessive urination,。

Doctor's answer:

In the first few days after birth, due to low intake, a baby's urine output can be very small, with only 4 to 5 times a day. After a few days, the frequency of urination will increase rapidly. Before 6 months, it can reach 20 to 30 times a day, with each time about 30 milliliters. After 6 months, as semi-solid supplementary foods are added and kidney function gradually improves, the frequency of urination will gradually decrease. By the time the baby is one year old, it will urinate about 15 to 16 times a day, with each time about 60 milliliters (approximately one-third of a standard glass cup). Between the ages of 2 to 3, the average daily urination is around 10 times, with each amount gradually increasing to about 90 milliliters. However, due to individual differences in babies, as well as factors such as water intake and temperature, both urine volume and urination frequency can vary significantly.

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