For a population to grow you need atleast 2,1 children per woman. Since Arabs have more, you will need ATLEAST 3 per woman...
Lets prohibite condoms and the problem is solved.
Syrians (the source of around 60% of migrants I believe?) only have around 2.35, so 3 should be fine. And you don't have to get rid of condoms or anything, It's honestly just like have more sex or something.
And besides, you probably don't even have to have three, as gender is not balanced among refugees, but rather seriously skewed. Around 60% are grown men, and only 17% women.
Edited 5/7/2016 16:07:21