so my 4 year old is just now 7 months later acting out or being jealous of the baby he's still sweet…

so my 4 year old is just now 7 months later acting out or being jealous of the baby he's still sweet and nice to him but when the baby is sleeping and I'm resting next to him he wants me next to him if I don't give him the attention he poops his pants and says he want to be a baby idk what to do....I'm in school they go to daycare we come home I sit in the living room with him as he watches cartoons and I fees his brother I put his brother down to clean or cool today I had to pack for moving then the baby gets fussy I feed him then he likes to be held honestly right now it's hard for me to give everybody attention evenly makes me feel bad insure won't be having any more for awhile I just want to give time to then evenly....