how do you discipline your 1 year old?

GRACE

I HAVE A NEWBORN AND A 17 MTH OLD IM NOT SURE IF HES ACTING OUT DUE TO JEALOUSY OR HES JUST GROWING UP. HE CONPLETELY IGNORES ME WHEN I SAY "STOP" or "dont do this" i have tried taking him out with me more since i home with the baby alot....idk im getting frustrated please help