Instrument Development and Psychometric Validation Using Confirmatory Factor Analysis of the Breastfeeding Relationship Scale.

: The Breastfeeding Relationship Scale (BFRS) was developed to measure mother-infant mutual responsiveness during breastfeeding. The purpose of this study was to develop and test the psychometric properties of the BFRS. : Construct validity of a 16-item three-factor model (Mother-Infant Breastfeeding Interaction, Perceived Adequate Milk Supply, and Breastfeeding Synchronicity) was assessed using confirmatory factor analysis (CFA) and reliability (Cronbach's alpha) across two independent samples. : CFA of the hypothesized three-factor model demonstrated good fit in both samples (comparative fit index >.90, root mean square error of approximation <.06, square root mean residual < .061). Cronbach's alpha for the constructs ranged between .73 and .83. : The BFRS is a valid measure of breastfeeding relations between mother and infant. Reliability was acceptable for all constructs in both samples.