Moms with toddlers n newborns

So I have started to notice my son is starting to act jealous of the baby he's starting to cry like her n talking like a baby and if I'm talking to her he will come and say no me he's been acting out as well not listening to anything I or my husband says 😣 it breaks my heat because it wasn't like this at first he seemed to be ok with it but she is now 7 weeks old and I can see a change in him I feel like he even treat me different some days I feel bad because I try my best to show him I love him just the same but it's not the same I have a baby in my arms most of the day n I know he's feeling left out it stresses me out every day I'm thinking am I neglecting him or what am I doing wrong I even cry to my husband because i feel like I'm not being a good mom to him to more I don't know what to do he does love her but he's just been acting out have any of you delt with this n if so what did you do