[maxander]

The birth rates in Western countries have been plummeting for the last 40 years. In fact, birth rates globally are declining almost everywhere except in countries that are still too poor to provide things like welfare. The data does not support your position.

[Jabanga]

The rate of single parenthood (particularly low income single parenthood) has been exploding in the West, concurrent with rising social welfare spending.

As for the general birthrate, that seems to be affected by income, not the availability of welfare. This is indicated by examples like Hong Kong and Singapore, which have much lower levels of welfare than most developed countries, and much lower birthrates.