Among @ infants , pre-ART correlates of later milestone attainment included : underweight and stunted ( neck control , walking and speech , all P values < @ ) , missed prevention of mother-to-child transmission ( P = @ ) ( neck control ) , previous hospitalization , World Health Organization ( WHO ) Stage III/IV , low CD@ count , and wasting ( speech and walking , all P values < @ ) , and low maternal CD@ ( speech , P = @ ) .