I have a nanny for my son who is now eighteen months old, she has been with us since he was ten months old. I recently noticed that the level of the emergency bottle of Calpol had gone down dramatically and I know we have not given him any. I put a mark on the bottle to see if it would go down any further, and sure enough, it has. She is the only other person in the house. Is it possible for Calpol to evaporate over time, or is she giving it to him and not telling me/writing it in the book? If so, would IBU to sack her on the spot for endangering his health, in that we could have come home from work and given him another dose without realising? I suppose she could be taking it herself, at a stretch - I just think this is a pretty serious allegation and I don't want to upset the relationship by suggesting she is giving it to him if it can just dry up anyway?