This document summarizes a research study conducted in Tanzania from 2013-2015 that examined the language environment of babies in their first year. The study was conducted across five districts in Tanzania and involved over 1,000 families. The study found that mothers in Tanzania do not typically talk to their babies much in the first year. However, international research shows that talking to babies from birth is critically important for brain development and future educational success. Talking and responding to babies helps encourage communication and language development. The quality of interaction between caregiver and infant is more important than just time spent together. Good early language skills are linked to better literacy, academic performance, employment opportunities, and reduced poverty and crime rates.