Having been born in a developing countries and went to US for university and work sometime there, I can say that US minimum salary and the other related perks are already significantly way better of most of emerging countries.
Likewise, people know that getting pregnant at 16 is not a great life plan. But the fundamentalist right have been campaigning for decades to control women's reproduction, including to prevent sexual health education, prevent contraception, and to deny access to abortion.
Lack of a social safety net (including health care) means that if you get a few bad breaks you could be living in your car with your kids. Essential medicine (like insulin) which should only cost a few dollars actually costs someone on minimum wage all their disposable income.
Saying that its better than a developing economy misses the point, the US is one of the richest countries in the world, and ordinary people are systematically taken advantage of by their own system of government. It's just tragic.
That will do far more for the children of the future than anything else.
The real question is: why won't America care about children?
https://www.forbes.com/sites/brycecovert/2012/07/16/the-rise...
America has a significant social safety net, but should responsible citizens pay for the upkeep of someone who has multiple children out of wedlock before the age of 20 without any means to support those children? Absolutely not.
People must take responsibility for their own actions.
But somehow I think you meant we should improve the lot of the parents in the hope that that would help the kids.