Naps

My firsborn was never up more than 1.5 hours at a time until she was nearly four months old! She was always napping!

Sometimes babies will sleep more when they are going through a growth spurt.

How long can he stay awake?

Is he active during his awake times or lethargic? If he is not active and wiggling, moving arms/legs (or whatever is considered active for him) then I would be concerned about illness. Otherwise my guess would be a growth spurt, like Christine said. I’ll be curious to hear the answers to the questions the other moms asked.