My 4 month old usually falls asleep at 10:30ish and sleeps through the night. Today I took him on a walk it was windy but sunny , he slept a bit in the car and woke up when we got home, had a full bottle and played a bit and then fell asleep at 7:30pm. I thought it would be a nap as he has been having shorter naps recently but it’s now almost midnight and he hasn’t woken up yet, my stress is that he’s in a fleece sweatshirt and leggings and I havent done bedtime or put his sleepsuit on, or changed his nappy since we got home 4.5 hours ago. Should I leave him to be in a deep sleep or should I gently wake him to change and then feed him?
I also think the walk or sun tired him out
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We go by the last feed. If its been more than 3 hours from a feed we will slowly start to undress and change our little, then do a feed and usually he falls back to sleep with full belly and sleeps awhile longer.

Sometimes they do that plus he could be going through the 4th month sleep regression soon . I say change his diaper and see how he reacts. That may wake him up . Is he sweating ?

My 4 month old sleeps through the night. I don't wake her for feeds or anything. She sleeps from 8 am until around 5 or 6 then will have a feed. She is gaining more than enough weight etc.
What did you end up doing?
So he started shuffling a bit sucking his thumb and I made sure he wasn’t too hot, and gently woke him up changed him and had a feed and then he soothed himself back to sleep in his crib !