Previous gender development literature demonstrates that children internalize gendered language, leading to changes in gender-typed behavior (Hilliard, Liben, 2010). The current study used a naturalistic mother-child paradigm to measure the frequency of gendered language during book reading. A content analysis was conducted on transcripts of 79 ethnically-diverse low-income mother-child dyads. Linear regression analyses tested whether mothers of girls used gendered language more than mothers of boys.