Sleeping to much maybe?


My son is 3 months old and last night he slept from 9:30pm to 7:00am (9 and a half hours) then he had a bottle and went back to sleep at 8:00am until 11:00am (3 hours) then he stayed up until 1:00pm, went to sleep and woke up at 4:30pm (3 and a half hours)? Is this normal? Is this part of a growth spurt? He hasn’t done this before but I have recently upped his formula to 200ml with 4 scoops because 150ml wasn’t enough, I’ve noticed it’s filling him for longer, he will drink the whole thing and just want to sleep lol