Wow, I am soo glad that I'm not the only one with this issue. My son would rather have his cup of milk than eat! He has to have it at night and at naptime. It just soothes him. I'm sure I could break him of it, but I haven't tried at this point, because I haven't really justified in my own head that it is harming him. If he does get cavities, which he doesn't, they are his baby teeth. They fall out! I always give him mostly water with a little bit of milk anyway, at these times. I may change my mind later, but I am not one to let my child cry and scream until he falls asleep. We let them have blankets or their favorite stuffed animals at bedtime, which could possibly cause a suffocating hazzard, but we do it anyway. Pick your battles. My husband has a cup of water on the nightstand every night when he goes to sleep. We are all individually different and have differences on what soothes us. I say use your mommy instinct and go with it. If anything, just give her water in her cup and be done with it! Hope this helps.