You two got married too young and you had a child too young. It's unfortunate for the child that you even had him.

You are not old enough or mature enough to be a good mother.
Neither of you are old enough to make a commitment, since you've both cheated already and you've only been married a little over a year!

That's ridiculous. How do you expect to have a MARRIAGE that lasts years and years? It's impossible. I'm not sure therapy will work as you two are just too young. You might try it -- see if a therapist will help. It's worth a try.
But I think the therapist might tell you both to just split, and go back to your parental homes and grow up. It might be for the best. God bless & take care of that precious baby. Hugs, Lee