Lucy figured out how to drink from a straw at 5 months, but lately she's started taking what's in her mouth and just letting it dribble out down her chin and front. It's so frustrating - the milk gets EVERYWHERE and I know she knows how to drink properly. I tried giving her a sippy instead of a straw, water instead of milk, and she does the same thing. Someone please tell me this is a short phase and she'll stop soon!