I've had children start with me and won't take a bottle or won't eat anything or drink from a sippy and by the end of the day I was panicked. But the more it happens the more I realize it's a part of the whole adjustment to daycare for some really panicked little children. I realized that the calmer I remain and the less stressed I become the better for the children. I agree with all the rest of the advice the others gave you already.

Before a child starts at my daycare I stress to them that consistency is important for the child's sake and ability to adjust to us. I ask them to get their child onto our meal and naptime schedules. I want to know exactly how the child eats at home and will stick to the parent's ways, whether it's bottles, sippies, pureed food or table food, but I'll definitely encourage things to change as quickly as possible so the child is eating the same thing as the rest of the children and using sippies for ease of transport when we go out.