Aiyoh, this is tricky lah, hitting and throwing things at that age bisa jadi phase, but if it's happening a lot and your friend's worried, really best to check with the pediatrician to make sure there's nothing else going on, you know? A few of us mums noticed our toddlers go through aggressive phases around that age, but doctor can rule out any issues and give proper guidance, setiap kid berbeza, so better safe than sorry!