Inclusion Criteria:  Women diagnosed antenatally with GDM by IADPSG criteria (15) Normal 6 weeks post-natal OGTT BMI range from 20-40 Physically fit to participate in moderate intensity walking  Exclusion Criteria:  Women with serious skin conditions (e.g. eczema) that precludes wearing the sensor for 14 days Women who have any other serious chronic disease such as chronic kidney disease and heart disease