This study examined socioeconomic gradients in different domains of early child development using data from the validation sample of the East Asia-Pacific Early Child Development Scales. The Scales were administered to 7797 3- to 5- year-olds (3889 girls) from Cambodia, China, Mongolia, Papua New Guinea, Timor-Leste, and Vanuatu and children's parents provided information about socioeconomic status (SES). Findings indicated that: (i) with the exception of Motor Development, all SES indicators predicted all domains of development; (ii) SES-development associations were largest for Cognitive Development, Socio-emotional Development, and Language and Emergent Literacy; (iii) wealth and maternal education were the best predictors of early child development; and (iv) significant SES-development associations were found in all countries except Cambodia.