Why don’t child benefits in Europe lead to larger families among locals?

Why in Europe, child Benefits usually don’t motivate larger families? They help pay costs of Raising children: food, clothing, childcare etc.

Here we have one kid because- of saving for college but in E. U. P. U. college is FREE, so no excuse to have less kids, so what is keeping local parents: who were BORN in Europe, from having many kids and getting same child money as parents who came from outside?

Why don’t child benefits in Europe lead to larger families among locals?
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