DS is 9 months old. He is breastfed at home and gets bottles of pumped milk at daycare M-F. We are going on vacation next week, so he will be breastfed directly. I am worried about what to feed him his first Monday back at day care. I have a freezer stash built up, but I have never used any of it before. Should I try using some of it now, just to make sure he will take it okay when we get back? (Although what do I do if he won't take it?) Or can I just thaw it that Sunday night and he won't notice a difference on Monday?