My 3 month old son slept 14 hours last night (with two quick night feeds) and I'm reading everywhere that at this age he should only be sleeping 10-12 hours at night. His bedtime is super early, 6-6:30 because he wasn't sleeping well as a newborn and this helped tremendously but now I think he's sleeping too much at night, should I make his bedtime later and if so how do I do that?
As long as your 3 month old has had adequate weight gain allowing him to sleep through the night is not a problem. Usually around 12 pounds in weight a baby can stop being fed at night and allowed to sleep without feeding. Generally babies sleep 10-12 hours at night plus additional naps during the day but a lengthier sleep at night with fewer naps during the day is fine as well. As long as your infant is meeting their developmental milestones and there are no issues with his growth I would encourage him to sleep and catch up on sleep yourself.