There are really two options to help people in developing areas of the world.
1) Basically free trade, people working in factories and plants funded by foreign investment provides a higher wage than local work and it's actually much safer, too. Which seems weird considering that we hear so much about unsafe working conditions in so-called sweatshops. While not up to the standards of safety of the West it's actually much safer than working in the field or chopping trees. Over time capital and technological accumulation along with higher wages and higher investment domestically they will achieve higher standards of living which will naturally decrease the birth rate as has been seen in the West and seeing in Latin America and Middle East.
2) Free labor markets. Instead of waiting for capital accumulation they could instead be brought to where capital has already been accumulated. This is generally the best solution economically speaking, I've read working papers of what a free labor market would mean with regards to GDP just between the United States and Mexico and its in the billions, that is, Americans and Mexicans would be richer by just having an open labor market. An open global labor market might increase output globally by trillions easily.
Humanitarian aid doesn't really negatively affect development of the economy and it doesn't really help it either as far as I'm concerned. A lot of the arguments aimed against Humanitarian aid that suppose that aid retards economic growth is really protectionist and flawed, giving someone a pair of shoes might harm a shoe maker locally but making shoes locally is expensive and super low skill labor anyways and won't increase the material well-being in the long run, the act of giving a pair of shoes to someone in a developing country is just that, a net gain of a pair of shoes. Humanitarian aid also can't improve their standard of living permanently, that would only come with immigration or capital investment and technical expertise to maintain the capital value. That is, giving solar panels to a village for power production would only be a short-term gift as it would wear out and they would be unable to invest in maintenance.