Wide variability in language development is present from very early in life, as early as eight months. Early experiences are among the most important predictors of language development, along with maternal education. Research has found that parental interventions that target caregiver's responsiveness and communication patterns are effective in changing parental behavior and promoting language development, with some reports of long-term effects on academic achievement and economic outcomes in adulthood. However, these programs are, in many cases, resource-intensive and difficult to scale up. In this article, we evaluate the effects of a low-cost e-messaging intervention directed at parents with children below the age of 2 on the caregiver–child dyad communication patterns. The Crianza Positiva e-messaging intervention consists of a series of text and audio messages delivered to the mobile phones of families three times a week for a period of six months.