Not doing enough?

Am

I have a 4 month old and I feel like I am not teaching, reading, stimulating him enough. I want him so learn and retain as much as possible, words, colors etc but I find myself doing chores around the house, holding him but not really engaging in learning very much. Can you mommies tell me what u do with your wee one to help learn. Or am I too worried at this point? I do read him books but should I be implementing other things? I don't want him to be delayed!