The purpose of this study was to investigate whether ethnicity is asso
ciated with insufficient milk supply (IMS) among breast-feeding mother
s. A major reason reported by mothers for early termination or introdu
ction of formula and/or solids is insufficient milk. A retrospective s
urvey was conducted among 42 black and 148 white breast-feeding mother
s participating in the WIC program in a midwestern state. The results
suggested that: (1) the incidence of IMS was similar for black and whi
te mothers; (2) controlling for education, black mothers initiated bre
ast-feeding later and stopped sooner; IMS mothers fed less frequently
and for shorter periods; and (3) controlling for education, there were
no ethnic differences in the determinants or indicators of IMS.