Abort the children before they get to the border?

If the US is worried about too many children coming across the border, for instance the children coming from Central America a few years ago, maybe it's better that the children not be born. Even abortion could be more humane than sending children back to places where they are killed by gangs and starvation. This may sound blunt. Actually, it's better to be a bit more compassionate. The lifeboat doesn't have infinite room tho, so birth control is good.