It's jealousy and he doesn't know how to express it I'm sorry I can't be much help I kmow I went thru it with my brother but my mom never yelled at me she explained things to me
@angelicavillasenor, I do let him do small stuff to help with his little brother but sometimes he could be playing with his brother then he would look at him and hit him or throw a car at him
Sometimes kids get a little jealous they feel like all the attention has changed to the new baby I know I did try not to yell at him if he does something in stead make sure to give some individual attention have the oldest help take care of the younger one little small stuff