Hi Samantha, I don't have any children, but I have friends that do, and when I've spoken to them they've always said the big step was from two to three. I think the reason being with two the parents arnt out numbered but once you get to 3 you are! My partner has 2 already, and is like at least 2 of my own so we'll hopefully eventually have 4, but a slightly different situation and larger age gaps. I guess the main questions are do you have the room in your house and do you have a large enough car for 4, and if not could you afford to move or change cars right now? Also, what if it's a multiple pregnancy? A friend of mine has 3 boys and wanted to try for a girl, and is now pregnant with two girls! At the end of the day it's your choice. X