Promote the use of effective birth control among populations incapable of responsibly raising children. That's the root cause, the rest is band-aids after the fact.

There are really good nonprofits in DC that help elderly, disabled, homeless people. They all need donations and volunteers. Off the top of my head...

Pathways to Housing
We Are Family
Miriam's Kitchen
Martha's Table
Mary's Center
SOME
McKenna Center
Christ House