J.M.
Maybe he is trying to get more attention now that the baby is here. You could try to be proactive with him and give him a little more attention up front, then anticipate when he is going to have a struggle and ask him ahead of time, "do you want Mommy to help you _____, or do you want to show Mommy how you can do it like a big boy?" Sometimes I also give an answer for them to mimic; "Please help me Mommy," or "I can be a big boy and do it." That way, you have given him the words to say and he only needs to choose what he wants and repeat it.