anyone else second time mums

Tia

My son is two months old and my daughter will be 2 in the next two months. Since having my son my daughter is being so naughty example, drawing on the walls, hitting, throwing toys and crying.. We havent stoped givingher attention at all, to be honest our son is in the bouncer quiet often because i dont want her to feel left out or alone.. am i doing something wrong what do i do??