Nah, girl you keep being the awesome you. If he still decides to bed other women (though its his "duty" to do so) he can. HOWEVER if he isn't devoted to just you then forget it. Keep enjoying this new life and the life spent with your new son. Don't cause yourself wrinkles trying to compete with the others, when you're on top.
Honestly if I was her I'd devote my life to my son, and living a carefree life. ☆゚°˖* ᕕ( ᐛ )ᕗ