Posters aren't enough - the Ugandian government has no family planning strategy, isn't interested in creating one and the population is exploding. The rate of growth is unsustainable and Uganda's population is expected to rise to 150m by 2050.There are poster campaigns in Uganda to promote the use of condoms due to the spread of HIV/AIDS.
The main resistance to this is from fundamentalist Christians, financed by parent Churches in the USA and Europe.
Family planning facilities need to be located in all the clinics where free vaccinations are currently on offer.
From my experience of Africa, I would imagine that a lot of African women who are in dire circumstances would avail of these services if they were promoted / available in their local area.
Some of the largest interantional NGO's have religion at the top of their agenda and this is a major problem when it comes to birth control. They are some of the world's most important providers, but need to look at population growth for the good of the people they are trying to help.