Infancy. The youngest child in my practice with new onset diabetes was about 8 months old. She had recurrent yeast diaper rash and had elevated sugar levels in her urine and blood. Any child can be tested for diabetes with a urinalysis and a blood sugar level, so technically a newborn can be tested for diabetes. Diabetes is very uncommon in young infants.
No screening tests. Screening for diabetes in children is not routinely done. However if one is symptomatic with thirst, weight loss, hunger, frequent urination, bed wetting or fatigue a random blood glucose and a1c should be done.