ANGRY AT 5/6

[Liiz]

My 5year old going to be 6 soon gets angry and this age and starts to cry and shout be rude and the list goes on... He was never like this but for the past 2years and seeing changes in him that give me the chills I don't know why his doing this we have our mother and son bonding time to find out but he just says 'I donno' am really worried cause I don't want his younger brother to copy him by mistake
Is this normal at this age or is something bothering him

[hippospot]

I would read Raising Boys by Steve Biddulph. At this age boys have a huge testosterone surge.