Inclusion criteria are women with a singleton, live gestation between 10
+0 and 17+6 weeks who have a self-reported pre-pregnancy, body mass index (BMI) > 25 kg/m2 and own a mobile phone. Exclusion criteria include: < 18 years of age; multiple pregnancy; comorbidities requiring significant medical and dietary management; discontinuation of care at hospital; or insufficient English to understand the intervention.