The birth rate is dropping because we're being taxes three times more than china and both wife and husband are working multiple part time jobs. It's impossible to raise a child in that environment, and although human instinct wins and a few are born, it is never a good environment.
In fact the kid's day:
8 hrs sleep
1 hrs parents
8 hrs state mandated brainwashing officer
4 hrs state subsidized nanny
2 hrs state controlled media
1 hrs parents
And on top of that the government takes ONE THIRD TO ONE HALF of the parents income. Half the parents income is just needed for self-sufficiency, the remainder is budgeted for children. So if the government takes one third in taxes, how can the parents raise two or more kids?