Mobile Health Intervention for Infants in Guatemala (18-m Intervention)

The intervention arm will receive the smartphone application, which has been designed to engage primary caregivers directly in the active monitoring of their infants' development, and to provide tailored feedback and support for the provision of nurturing care. Study staff will make an initial home visit (less than an hour) to install the application on the caregiver phone and demonstrate use and collect baseline data. Subsequently, in the intervention arm, staff will make monthly visits (approximately 15 minutes duration) to assess functionality of the smartphone and answer questions/reinforce use.

The control arm will receive printed caregiving materials. In the control arm, staff will make monthly visits (approximately 15 minutes duration) to ask if there are questions about the printed caregiving materials.