3 month old eating schedule

Hi, hope everyone’s doing well with with pandemic going on.

My son is 14 weeks old and ever since he was 4 weeks old he’s slept through t he night! I fee so lucky but I’m worries if he’s eating enough. He eats 6 ounces every 4 hours but he’s asleep by 8-10 and not up until 9-10. He’s on acid reflux medicine so I give him his meds once he wakes up and then 20 minutes later is when he’s able to eat. So throughout the day he only ends up eating 4 times. Is that normal? He is gaining weight but slowly... we went to the doctors on 3/17 and he weighed 12.3 pounds. Before he was gaining a pound a week and now it seems he’s not gaining as much.