The A.D.A. says the Fasting Plasma Glucose Test is the most reliable test for testing diabetes. A 16 month old child should be able to fast over night. It sounds like you are smelling ketones .
Some children produce lots of ketones during a normal overnight fast.
Some even have low blood sugars during this time. You need to explore this with your pediatrician. Fasting glucose of 126 or random glucose of over 200 with symptoms is diabetes. Comments and Feedback . Privacy statement .