That sounds like way too much formula if you ask me. Most of my 12 month olds come with one 8 oz bottle of milk that they get AFTER they have eaten lunch. And that's it for the day. It's no wonder he isn't hungry. Also, at my house no one is allowed to get up from their chair until everyone is done or almost done eating. So if a picky kid just eats one bite and is done within 5 mins, he still has to sit and wait for the others to finish, sometimes up to 20 minutes. What happens then is that they get bored of waiting, will start playing with their food a little, and eventually try a few ore bites without me having to ask. So my advice is, ask mom to cut back on formula, and leave him in his high chair even when he seems to be done, but ONLY give small portions to avoid throwing. If he throws everything on the floor, delay getting him another serving, eventually he will learn that throwing food=not eating or having to wait a while before getting more.