Fluids are a must and if she won't take the new bottle then maybe they can try an oral syringe to give her something to drink. I understand where a lot of people are coming from with saying a child that old shouldn't have or need a bottle, but the child just had surgery. A traumatic event isn't the time to make drastic changes. If she can't have the old nipple then give her the new bottle with new nipple and try to coax her to drink from a syringe. Happy faces all around.