Breastfeeding Duration and Exclusivity. Based
on Labbok & Krosovec’s classi¢cation (Labbok &
Krasovec, 1990), the Infant Feeding Questionnaire
was used to assess breastfeeding duration and exclusivity
at 4 and 8 weeks postpartum. The amount
of breastfeeding was recorded as (a) exclusive
breastfeeding (breast milk only); (b) almost exclusive
breastfeeding (breast milk and other £uids,
but not formula); (c) high breastfeeding (oone bottle/
day); (d) partial breastfeeding (at least one
bottle of formula/day); or (e) token breastfeeding
(breast given to comfort baby, but not nutrition).
Breastfeeding was de¢ned as any breast milk: either
by breast or expressed breast milk via bottle or
tube. If a mother was no longer practicing any
breastfeeding, the date of discontinuation was recorded,
and she was classi¢ed as bottle feeding
(formula).