Infant mortality in developing countries.
D000367:Age Factors; D002675:Child, Preschool; D003906:Developing Countries; D003968:Diarrhea, Infantile / Q000401:mortality; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn