We examined 91 children under the age of 13 years with definite HIV infection born to HIV-seropositive women. The clinical spectrum of HIV infection in children younger than 13 years who are born to HIV-infected mothers was revised in 1994 into four clinical categories: category N (not symptomatic), category A (mildly symptomatic), category B (moderately symptomatic), and category C (severely symptomatic). Mucocutaneous manifestations were found in 47 (51.6%) of these children. The prevalence of mucocutaneous manifestations in categories A, B, and C were 4%, 62%, and 75%, respectively. The mucocutaneous manifestations in patients in categories B and C were significantly more common than in those category A (p < 0.001). The most common finding was oral candidiasis (36.3%). Drug rash, pruritic papular eruption, herpes tester, cutaneous candidiasis, Penicillium marneffei infection, and herpes simplex virus stomatitis were found in 6.6%, 5.5%, 4.4%, 3.4%, and 2.2% of patients, respectively. All three patients who had disseminated P. marneffei infection were in category C.