Why is my two year old son such a baby?

most moms ive talked to, get to a point with their kids where they think "have I screwed them up for life?" or "what the heck is wrong with this kid?" my daughter would be so sweet and kind, then the next week be a holy terror,lol sing and whining, I thought, where did my daughter go and who is this brat? lol, just be consistent in punishment, it takes awhile, some kids will test you longer then others, and you may find he will start being a great little boy then regress back to whining and being bratty, just resort back to punishments and wait it out, most likely you'll see a huge turn around for the better, best luck