I have no doubt that it is easier to have 4 kids than 3 kids.If you really think about it, having 4 kids is like doubling your baby shower. You do not need a lot of stuff for each baby. You only need one but bigger diaper bag and the same baby clothes. It is not so expensive for each baby because society tells us that a baby does not need much stuff. There is less crying in a 4 kid house as compared to a 3 kid house. There is also more support in a 4 kid house. People remember birthdays of each baby and are happy to be able to help you with it. It is fun to have more people around while you are with your babies, they love having guests!There are some negative aspects of having 4 kids: it can be harder to buy specific gifts for each one especially if they are boys, you will have more laundry, baby food is cheaper per kg, there will be less quality time with your partner if they had not sleep-in nanny (at least I am sure this will be the case for me).In the end it is up to you and your family if having a few extra in this world or just fine with 2 more in yours is worth it or if you choose another way (2 kids).