I'm not really qualified to answer but I wanted to give you a hug I cried the first time ds had water from his sippy cup when he was 6 months old! I imagine it would be a sad say when he wants a cup instead of boobie I noticed you are pregnant, were you wanting to tandem feed? I believe that some babies self wean when you are expecting again so you might need to get your head around it if he keeps looking for a cup. (sorry if I've upset you) but just wanted to help prepare you I guess incase that does happen