Continuity and discontinuity in maternal sensitivity from 6 and 24 months to 42 months were examined in a sample of 135 disadvantaged mothers and their firstborn children. Sensitivity at 6 and 24 months accounted for 18% of the variance in 42-month maternal sensitivity for boys, 14% for girls. Discontinuity was examined using residual scores. Less maternal sensitivity than predicted was related to stressful environmental and child characteristics for both boys and girls, while greater sensitivity than predicted was related to mothers' experiences of emotional support, girls' positive individual characteristics, and boys who were seen as unengaged.