Who cares for children is an important determinant of women's work eff
ort and their potential earnings. Although research on child care has
grown dramatically over the last decade, previous studies have ignored
the effects of child-care arrangements on female employment. Using th
e Survey of Income and Program Participation, a 1985 sample of employe
d mothers of preschool-age children was selected and determinants of q
uitting work by 1986 were examined. Women who relied on their husbands
for child-care supervision were found to be more likely to quit work
than women in the reference category, in addition, this effect was str
onger among low-wage women. The need for additional work on the relati
on between child care and the female labor supply is examined.