Notes. Standard errors clustered by town. Covariates included: child’s gender, an indicator of high household wealth index, maternal PPVT score, teenage mother, an indicator of high municipality population, previous attendance to a childcare center, department and interviewer fixed effects, baseline weight-for-age and height-for-age Z-scores, the difference in days between baseline, and follow-up data collections. In the treatment group the potential dose varies from 34–58 weeks.

|$^{**} p < 0.05$|⁠.