Some of my mom friends have suggested my son might be teething early. He is 3.5 months and has begun to drool and chew/gum/suck on his hand or my shoulder/shirt etc and his pacifier. The said their kids cut teeth at 4 months. He also has been rufusing a bottle lately but has no problem nursing - spits up a bit more though. Any thoughts...and if he is what should I be expecting?