It's absolutely a great place for imagination, where you can "have" a child with anyone you want on this website and see what the result of your combination will look like, hahaha.
As for how to do it, it's as easy as pie: upload a photo of yourself, crop the facial area, then choose a celebrity you want to make it with, and in a few seconds, you've got a baby (what a boon for women, no need to endure the pain of being pregnant for ten months!). Similarly, you can also have a baby with your usual fantasy partner by providing photos of both parties. This service is free, and no registration is required. However, if you register, you can save all the photos of your kids online.