I remember this faze
Does he have a specail toy u can make just his and only his??
My DD never woke through the night but she was very much into the "mine" faze
Its a hard thing to do but if he grabs something thats not his u need to get down to his level (I know being preg will make this hard lol) but tell him "no sweetie thats not urs but remember ...... is urs and only urs, its ur special ....." and explain this to the daycare too as they might be able to tell u if he's doing it there too and have any other suggestions