Generally speaking, the number of times a three-month-old baby urinates is between 15-20 times normal. Normal children will change the frequency and volume of urination due to kidney development, metabolic effects, water intake, temperature changes, and sweating. Within a week after birth, about 5-6 times, after that, with the increase of diet and water, growth and metabolism, the frequency of urination of the baby is generally 15-25 times, more than 30 times, are considered normal; after one year of age, with the development of the kidneys, control ability increases, the frequency of urination of the baby can be reduced, generally between 15-20 times; if in preschool or school age, the urination center of control increases, urination may be between 5-10 times. Therefore, in the third month, babies generally urinate 15-20 times a day, which is often normal. Of course the number of times a baby urinates may increase due to the amount of water drained, the amount of water drunk and the frequency of urination, but generally good conditions are considered normal.