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Might it be Teddy Bear Tales? https://www.amazon.com/Book-Five-Minute-Teddy-Bear-Tales/dp/1843228890
This sound familiar to me, but I don't quite remember it either.
It's not one of the "Rupert Bear" books is it?
https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjDhZvs1ZnVAhWJS7wKHflTC8AQFggoMAA&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FRupert_Bear&usg=AFQjCNE7YmHixFgqNiuf8qWh9-gYT1Yumw

Does anyone remember this children's book (80s or 90s?) about these two little bears siblings (90% sure they were bears). Their parents went out for the evening and then the bear children got really scared because they thought there was a monster outside, and they couldn’t wake up their babysitter who kept sleeping on a comfy chair.Eventually, their parents came back and they found out the monster was just a kite that got stuck in a tree and then they all ate cookies. I'm pretty sure the big babysitter bear says "me three" when the parents ask who wants cookies. It s driving me absolutely insane trying to remember. Please ease my pain. Thank you.