The solution is simple:
If you're pregnant on Dec. 31, you should get the money even if your baby is born nine months later.
I also heard the opposite in Cyprus. A few years back, they inaugurated a cash-for-babies program. As the program had not begun, large numbers of women had abortions in anticipation of the program.
I don't think cash for babies scheme do much, really. If you want to encourage people to have children, start by changing the anti-child mentality.