My 5.5yo dd is going through a phase where she seems to only be able to think about what she wants and if her younger brother has something/wants something/does something then she wants it or wants to do it first and trys to manipulate or boss him into letting her do it and getting her own way. There is quite a lot of stropping about, which I gather is quite usual at this age, but at what age can children start to empathise, thinking about putting others first and the consequences of their actions? I also have a 3 month old and she is fabulous with him, very helpful and loving.