Although text messaging interventions targeting parents of older students have shown promise for improving a variety of outcomes, evidence on text-based outreach and support for parents of young children is just emerging. We explore programmatic data from a text-based mentoring intervention designed to support postpartum mothers and promote healthy child development. We coded 18,897 texts from 162 mother-mentor pairs to describe their interactions. On average, mothers remained engaged for 296 days. Mothers and mentors discussed both child-focused (28% of exchanges) and mother-focused topics (8%). Mentors responded to 86% of mothers' problems within 48 hours, offering emotional support (39% of offers) and advice (35%) most frequently. Based on the demonstrated ability of the programme to engage mothers commensurate with other early parenting interventions, the content addressed in mother-mentor interactions, and the mentor offered supports, we conclude text-based mentoring may be a promising strategy for providing outreach and support to postpartum mothers.