Patricia I would just suggest to the mom to have sitter use a cup. The baby has made his preferences clear. This will actually turn out great for the mom because babe will get his "suck" needs met at moms breast. I never suggest the use of a bottle for a babe to use when at a sitter unless mother asks specifically about bottle use. I always suggest cup use first. This is just is so complicated. So many baby's just get confused about when they can have mom & when they can't. Mom is dealing with separation issues. Sitter is frustrated because babe wants their mom & breastfed babes tend to bottlefeed slowly which is an imposition to most sitters. However, there are many babes that just seem to be able to feed both bottle & breast beautifully. Many moms using bottles tend to wean early, just a fact of a busy working mom's life. They tend to use bottles more & more on the weekends, they get too busy to pump, and then before you know it baby is weaned. And the mother.... she just wants to give her baby breastmilk, no matter the delivery method. yes, I have been a working mom, with a great employer. I never used bottles, but found sitters close by so I very rarely had to miss a feed. My way of dealing with all those issues. Lora Gleaton La Leche League Leader