I had to leave my DS with MIL yesterday to take DD to a hospital appointment. My MIL is obsessed with tummy sleeping and although I know that LOs usually sleep better on their tummy's, I have expressly said that I don't want my LOs put into their bed on their tummy. I came home yesterday and there my baby was, on his tummy. I am so angry about itand can't believe that she would do it, she wasn't even in the room with him. Now I don't feel like I can trust her to look after him which is going to cause all sorts of issues. Am I overreacting?