My six year old broke down sobbing last night,saying she has bad thoughts in her head and thinks about hurting her 4month old sister. I calmed her down,she said she loves her but has thoughts about hurting her and thinks she may be a bully? I am very concerned and have an appoint to see the Gp next week...has anyone else experienced similar,I am hoping its just jealousy and not a sign of something more serious.