My 19 month old spits out his water or milk every single $^^#!$^^ time he has it. He'll drink some and then he'll start spitting it out. When he does that, we take the drink, tell him that we don't spit out whatever it is and that he's all done. He still does it. Every time. Every day. For the past 7 months ever since he's started using a cup. Im so sick of this behavior. Can I slap it out of him yet? Help!!!!!!!!!