It’s absolutely fine if he’s still asleep, it could be the weather or it could just be developmental, we tend to have a couple of days where he sleeps really well and then back to normal for a week 😂
My little one was on and off sleeping 8-8 last night (she’s 15wks) very lethargic in between wakes for feeds. Heat takes it out of them a bit I think xx
I've noticed this too but thought it was just an age/maturing thing at 13 weeks. I didn't think anything of the weather but now you've mentioned it... ☀️