Thanks for posting on HealthCareMagic. Wishing you a Happy Easter. Blood sugar below 40 mg/dl indicates hypoglycemia that is low blood sugar although less than 70 mg/dl is considered by some standards as the cutoff. If symptoms are are present, I will consider even 63 as hypoglycemic. Symptoms to look out for are: * Shakiness * Nervousness or anxiety * Sweating, chills and clamminess * Irritability or impatience * Confusion, including delirium * Rapid/fast heartbeat * Lightheadedness or dizziness * Hunger and nausea * Sleepiness * Blurred/impaired vision * Tingling or numbness in the lips or tongue * Headaches * Weakness or fatigue * Anger, stubbornness, or sadness * Lack of coordination * Nightmares or crying out during sleep * Seizures * Unconsciousness Hypglycemia can occur in a child with diabetes type 1 on insulin and you should be aware of the symptoms and need to intervene immediately in case you see the symptoms. In case of hypoglycemia you need to take 15-20 grams of glucose or simple carbohydrates like sugar immediately and recheck the blood glucose after 15 minutes. . Hope that helps. Feel free to revert back in case of further queries if any.