There is no specific number of times a child should urinate the most important is the quantity of urine passed in the day. It depends on how much fluid or breastfeeding you do at night. Since it is a boy you can take off the diaper and watch him after breastfeeding/feeding well, if no urine or very small quantity in 4 hours, take him to the hospital so the urine can be measured accurately to take a decision. The best way to know is to breastfeed well and then check if he really passes urine don't rely on diaper feel some are hyperdry, check the urine stream with your eyes.