Haiti is overpopulated, and reducing population growth would materially improve their living standards.
They should emulate the experience of Singapore.
This is from a website:
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Since the mid-1960s, Singapore's government has attempted to control the country's rate of population growth with a mixture of publicity, exhortation, and material incentives and disincentives. Falling death rates, continued high birth rates, and immigration from peninsular Malaya during the decade from 1947 to 1957 produced an annual growth rate of 4.4 percent, of which 3.4 percent represented natural increase and 1.0 percent immigration. The crude birth rate peaked in 1957 at 42.7 per thousand. Beginning in 1949, family planning services were offered by the private Singapore Family Planning Association, which by 1960 was receiving some government funds and assistance. By 1965 the crude birth rate was 29.5 per 1,000 and the annual rate of natural increase had been reduced to 2.5 percent. Singapore's government saw rapid population growth as a threat to living standards and political stability, as large numbers of children and young people threatened to overwhelm the schools, the medical services, and the ability of the economy to generate employment for them all. In the atmosphere of crisis after the 1965 separation from Malaysia, the government in 1966 established the Family Planning and Population Board, which was responsible for providing clinical services and public education on family planning.
Birth rates fell from 1957 to 1970, but then began to rise as women of the postwar baby boom reached child-bearing years. The government responded with policies intended to further reduce the birth rate. Abortion and voluntary sterilization were legalized in 1970. Between 1969 and 1972, a set of policies known as "population disincentives" were instituted to raise the costs of bearing third, fourth, and subsequent children. Civil servants received no paid maternity leave for third and subsequent children; maternity hospitals charged progressively higher fees for each additional birth; and income tax deductions for all but the first two children were eliminated. Large families received no extra consideration in public housing assignments, and top priority in the competition for enrollment in the most desirable primary schools was given to only children and to children whose parents had been sterilized before the age of forty. Voluntary sterilization was rewarded by seven days of paid sick leave and by priority in the allocation of such public goods as housing and education. The policies were accompanied by publicity campaigns urging parents to "Stop at Two" and arguing that large families threatened parents' present livelihood and future security. The penalties weighed more heavily on the poor, and were justified by the authorities as a means of encouraging the poor to concentrate their limited resources on adequately nurturing a few children who would be equipped to rise from poverty and become productive citizens.
Fertility declined throughout the 1970s, reaching the replacement level of 1.006 in 1975, and thereafter declining below that level. With fertility below the replacement level, the population would after some fifty years begin to decline unless supplemented by immigration. In a manner familiar to demographers, Singapore's demographic transition to low levels of population growth accompanied increases in income, education, women's participation in paid employment, and control of infectious diseases. It was impossible to separate the effects of government policies from the broader socioeconomic forces promoting later marriage and smaller families, but it was clear that in Singapore all the factors affecting population growth worked in the same direction. The government's policies and publicity campaigns thus probably hastened or reinforced fertility trends that stemmed from changes in economic and educational structures. By the 1980s, Singapore's vital statistics resembled those of other countries with comparable income levels but without Singapore's publicity campaigns and elaborate array of administrative incentives.
http://www.country-studies.com/singapore/population.html