great advice here...... honestly when it comes to kiddies...of any age... mums and dads stay calm...gggrrrrrr secretly within...never let the guilty party know they are getting to you ... to them its like yesssss l got a reaction... be consistant..always... go grab the nanny dvd s... the naughty corner... naughty chair.. wow.. wish ld thought of that many moons ago when my tribe were going through the wobbly stages..you know usually there is some reason why a childs behaviour has changed...not in all cases .... could be something soooo simple too... best o luck...all part of growing up lm afraid