20 months hit me and don't want me

My 20 months baby started to hit me whenever he is angry and when things don't get on his way, and he no longer want me to acc him to sleep anymore. I used to be his go-to person. This happened 1 month plus after I gave birth to my 2nd baby. He seems to condemn me now. Will push me away at night when I try to pat him. My 2nd baby is abit fussy at night and will often wake my firstborn with her loud cry. So now my husband will tc and sleep with first born in our room, and I will tc of our 2nd baby in another room. Is this the reason why my first born distance from me? Any one have the same issue? I felt so disheartened. #AskingAsAMom #tiredmom #Needadvice