Awwww, sister, what I am about to say may seem a little harsh, but it's the most honest thing. Once a girl gets married, her parents should not really involve much. You must be thinking, 'WHAT THE HELL??!!', but this is true. The reason why I say this is because it causes less friction between you, your parents, your hubby and his parents. In other words, the best is to do something which your hubby and you are fine with, and now that Masha'Allah Allah swt has granted you the most beautiful gift, a baby boy, you need to think about his future. If you feel moving out to the big city is appropriate then so you should.
If you parents think that they will not be able to see their daughter, valid point, BUT now that you are married, hubby and child must come first. Sorry sister, but that is what I believe. :)
Its funny you say that, if it was a guy posting the same question everyone would say how parents are first priority. I smell double standards.
I am not gonna tell you what you are doing is right or wrong, its an important decision and you know whats best for you but please consider your parents feelings too. Try to convince them its the best thing for your family.