hi my baby boy is three years six months active boy. he used to throw things from balcony during his second year. he mostly stopped doing that. but now again he started throwing things through balcony. inside home too he started throwing things sometimes not more like before but yet he is doing. I tell him sometimes when I see him doing like that but he throws things when I am not present at the moment. is it normal for toddlers of this age?? do he Stop all this behaviour