Breastfeeding duration for various gestational age groups.

BF = breastfeeding, corr = corrected, PNA = postnatal age (chronological age).'*If an infant initiated breastfeeding, the duration was calculated form birth, likewise if exclusive breastfeeding was established. Thus some of theese infants were tube-fed expressed breast milk at this time point. The percentage represents infants, whose mothers' had not given up exclusive/any breastfeeding before one month.Breastfeeding duration for various gestational age groups.