No, you won't.
You will guarantee a huge downturn in extra-marital sex.
Extra-marital sex is a prerequisite for illegitimate births.
It's simple. Reward a behavior, and you get more of it. Punish a behavior, and you get less of it.
But keep excusing irresponsible behavior, then complain about the consequences of that irresponsible behavior. It seems to come naturally to you.
Hey, Unum? what's with the personal insults? That's twice now.
Baleful social and financial consequences for illegitimate live childbearing used to result in both a lot of early marriage and a lot of early childbearing followed by adoptions --- for instance, in the 1950's thru mid-60's. Now that abortion is (damnably) legal, I think it's reasonable to infer that, given a renewal of financial penalty, some unmarried women will refrain from sex, but many more will not: they'll simply refrain from live childbearing.
If you can resist the ad hominem jabs --- a practice which I pointedly avoided doing to you --- I am willing to continue this discussion.
If not, not.
Have a nice day.