Maternal Race Trends in Early Infant Feeding Patterns in Hawai'i Using Newborn Metabolic Screening-Birth Certificate Linked Data 2008-2015

Breastfeeding provides optimal nutrition for infants, including short- and longterm health benefits for baby and mother. Maternity care practices supporting breastfeeding after delivery increase the likelihood of exclusive breastfeeding. This study explores trends in early infant feeding practices by maternal race and other characteristics in Hawai'i. Data from a linked 2008-2015 Hawai'i Newborn Metabolic Screening and Birth Certificate file for 128 399 singleton term infants were analyzed. Early infant feeding occurring 24-48 hours after delivery and before discharge was categorized: Early formula feeding; early mixed feeding; and early exclusive breastfeeding. Differences were assessed over time by maternal race and other socio-demographic characteristics. Further assessment of maternal race included a generalized logit model adjusting for maternal age, marital status, county of residence, type of birth attendant, and birth year. Statewide, early exclusive breastfeeding increased from 58.8% in 2008 to 79.1% in 2015 (relative increase=+35%); early mixed feeding declined from 31.1% to 16.0% (relative decrease=-49%) and early formula feeding declined from 10.1% to 4.9% (relative decrease=-51%). Most maternal race subgroups experienced increases in early exclusive breastfeeding and decreases in mixed and formula. Japanese mothers were 2.15 (95%CI=1.90-2.42) and Korean mothers were 1.73 (95%CI=1.37-2.18) times more likely to practice early exclusive breastfeeding compared with white mothers. Several subgroups were less likely to practice early exclusive breastfeeding compared with white mothers. Substantial increases in early exclusive breastfeeding in Hawai'i occurred across all subgroups. Development of culturally appropriate hospital practices, particularly in those with persistently lower estimates, could help improve early exclusive breastfeeding.