DD is about 5 months old and BF is going WAY better than I could have dreamed. So good that I am scared of offering sippy cups. I don't want her to fill up so she wont want to nurse. And I don't know what to put in the cup (BM/water?) When I formula fed the boys I gave a sippy cup with a meal, but I don't want to spoon feed her until about 6 months, so should I just not offer a cup until then? I am scared that my milk supply will change and I will regret the cup.