This correlational study of mothers and their 6-month-old infants examined the importance of social support and stressors for parenting and infant development. Mothers (n = 79) were primarily White, married, and ranged in socio-economic status from low to high. All data were collected in mothers' homes when infants were 6 months old. Diversity of sources of social support and diversity of father support were positively related to parenting (quality of stimulation in the home). Diversity of sources of social support buffered the negative relationship of maternal fatigue (stressor) to parenting. Parenting was related to social, hearing-speech, locomotor, and general development. Additionally, social support and aggravation (people in the mother's said network who make life difficult) were related to infant development, independent of parenting.