Just a loose thought I'd like to share. Would love to hear those who disagree:
Assuming no birth control takes places - the poorest regions have also the highest population growth already and helping them would lead to more of the same, amplifying original problems of those regions creating bottomless well of help.
Note to the author, and to other readers: If you have loose thoughts you'd like to share, I recommend trying the "Shortform" option, which specifically marks a post as being brief, quickly written, and exploratory.