It is extremetly possible because talk of babies is probably all he is hearing at home, the crib and nursery is getting set up, his old things that were put away are suddenly out. Mom is likely tired and uncomfortable, can't bend down to play with him, has trouble carrying him, has no lap for holding him, etc. - all the stuff that comes with pregnancy.

Do not feed him because he is also testing the limits at your house and making sure that your rules (self feeding) still stand so make sure they do. At the same time make sure for snacks that he gets things like cheese and crackers that he will pick up and eat so he isnt' going hungry. He should be off the bottle by this age and mom is doing him no favours with a new baby due soon.