I have a 5-year-old son and three-month-old daughter. My son seems to have adapted fairly well to the new addition but there is one major problem. Every time he sees her napping he will scare her to wake her up. She gets absolutely hysterical, so he gets the reaction that he wants. I do not know what to do. We live in a small 1927 home so the only room that has locks is the bathroom, otherwise, I would just lock her in the room, although, I still think he would find a way to wake her up.