This study employs an intra-national and cross-national, prospective, and longitudinal design to examine age, gender, region, and country variation in group mean-level continuity and individual-differences stability of emotional availability in child-mother dyads. Altogether, 220 Argentine, Italian, and US American metropolitan and rural residence mothers and their daughters and sons were observed at home when children were five and 20 months of age. Similar patterns of continuity and discontinuity of emotional availability from five to 20 months were observed across regions and countries, but not between genders. Stability of emotional availability from five to 20 months was moderate and similar across genders, regions, and countries. Universal and gender-specific developmental processes in child-mother emotional availability as revealed in intra-national and cross-national study are discussed. (Contains 3 tables.)