I have a question for you mommies. my son is 2 months going to be 3 in 2 days his sleeping schedule…

I have a question for you mommies. my son is 2 months going to be 3 in 2 days his sleeping schedule has changed and he's starting to sleep ALOT longer at night , last night he went to sleep at 9pm and didn't wake up till 5am my question is do I let him sleep or should I have woke him up to eat? when he does wake up he finishes a whole bottle but I'm just not sure. is that normal?