My 9 month old loves to play with her Sippy Cup and try to drink from it. She gets bottles while I am at work and nurses when we are together. Would complimenting one of her bottle feedings with a Sippy Cup cause any nipple confusion? It's not a nipple, but it's plastic, soft and she has to suck on it to get the milk out. It's one of those "starter" sippy cups. Also, she likes breastmilk out of it cold, right from the refigerator. Will that cause any confusion?