Hi , my baby boy is 3 year old . He is not listen anybody shows more tantrum , hit. why is it milestones or age fault

A. There is no milestone no age for sometimes what happens is when the kids are really pampered sometimes at home and it’s like the apple of the eye grandparents are also there they get spoiled and behaved like this you need to change your approach towards a child to make your child behave properly and has to learn how to listen and follow what has been asked to