What to do to correct routine for baby?

Hi all,

I am a first time mom and would like some advice about  correct routine for baby .

my son Jimmy 7 years old. He has a habit to eat while playing. if I did not give him any game play something, he refused to eat. He loves to eat while watching cartoons or promotions which is not good for the child's stomach. I was nervous about it

What should I do for my son to give up the habit?Thanks in advance!