This stupid "why didn't the mother just not have sex in the first place" thing is not the most common argument in the prolife movment (it is the most common argument for douchebags). If you look at prolife activist in social medias, you can see that they just want the baby and the mother to be safe, and the majority of them care of them in the future, after the baby's birth.
For the budget, you can't make anyone happy, in fact, you can't make anyone happy on any topic. Legalize abortion ? It will kill unborn babies ! Condemn abortion ? It's sexist !
If we want to make a quick and effective measure in childcare (before and after birth), classic negotiations, i.e. long, postponed and unsuccessful will be useless. In this case, a referendum is necessary. This is a free country, isn't it ? Let's ask the people's opinion. Do you want to lower your taxes to fund childcare ?