Principal findings of the study
This is the first RCT to investigate the effect of a staged, nurse-led telephone plus SMS support intervention on children’s BMI at age 3 years. Our findings suggest that although the combined intervention had no significant overall effect on BMI, the intervention was significantly associated with lower mean BMI of children from a lower household income family. The intervention was also significantly associated with reduced odds of eating in front of the TV and improved odds of meeting the dietary and activity intervention recommendations among the intervention participants.