Pragmatic Randomized Clinical Trial to Limit Weight Gain in Pregnancy and Prevent Obesity

Inclusion Criteria: * Age≥18 * Singleton pregnancy * ≤15 weeks gestation with documented prenatal weight and height in electronic health record * Body mass index ≥ 25.0 kg/m2 * English-speaking * Has smartphone, laptop or tablet and willing to use it for this study * Has email address and willing to use for this study Exclusion Criteria: * BMI \<25 kg/m2 * Multiple fetuses * History of pre-gestational Type 1 or Type 2 diabetes or taking diabetes medication for treatment of diabetes prior to first prenatal visit * Prior history of severe preeclampsia, pre-term birth (\< 32 weeks gestation) * Poorly controlled blood pressure (\> 160/100 mmHg) * Substance use disorder or positive urine toxicology (except for THC) for illicit substances (screening done as part of routine care) * Psychiatric hospitalization in last 12 months or diagnosis of severe mental illness that is not well controlled * Active diagnosis of an eating disorder * Unable to walk 1 block without pain or shortness of breath * No email address * Unable to speak or read in English * Planning to move in next 12 months