Big muslim families?

According to rumours muslims are having so many kids that they are going to outstrip everyone else. Really? Can someone please tell me where these so-called big families are? Every blog I come across that talks about big families is Christian! Most muslims I've come across limit their kids to 2 or 3 kids. If you do have more they chastise you. Yet these rumours linger. Have you ever seen a blog about big muslim families? If you have please direct me to it. I expect to be disappointed. If you have ever wondered what its like to live in a big family then read this, its from a Christian family but its so true that I couldn't stop laughing.