Transient Neonatal Diabetes Mellitus: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Transient Neonatal Diabetes Mellitus?
A pediatric endocrinologist, a doctor who specializes in hormone problems in children, usually treats this condition. Because it is rare, babies are often cared for at a hospital or clinic with experience in childhood diabetes. The care team may also include a dietitian and nurses.
What it is
Transient neonatal diabetes mellitus is a rare form of diabetes in which blood sugar stays too high. It appears in babies during the first few months of life. Most babies stop needing treatment within the first year, but many develop lasting diabetes later in life.
Symptoms
Babies with this condition often have trouble gaining weight and may grow slowly before birth. They may urinate often, feel very thirsty, and become dehydrated. High blood sugar can also make a baby fussy and unusually hungry.
Causes and who gets it
This condition is caused by changes in certain genes, most commonly on chromosome 6. Some inherit the changed gene from a parent, while others develop the change before birth. Because it is genetic, a baby who has it may have a sibling with the same condition.
How doctors diagnose it
Doctors diagnose this condition by testing a baby's blood and urine for sugar. Genetic testing can then find the gene change causing the problem and show whether the diabetes is likely to be temporary or lasting.
Treatment
Treatment focuses on bringing the baby's blood sugar down to a safe level. Many babies need insulin, a hormone that helps move sugar out of the blood and into cells for energy. Some babies may also need fluids if they are dehydrated. Most children stop needing insulin within the first year, but some develop diabetes again later, which is why regular follow-up care matters.
When to see a doctor
Parents should contact a doctor if a baby is drinking a lot, urinating often, losing weight, or not growing as expected. Any baby with these symptoms needs a medical evaluation right away.
How a direct primary care or concierge doctor fits in
A direct primary care doctor is paid a flat monthly fee instead of billing insurance. A concierge doctor usually charges more and often works alongside insurance. Either kind can monitor growth, order blood sugar checks, and watch for signs that diabetes has returned, but they cannot replace a pediatric endocrinologist for a rare newborn condition.
Common questions
Does transient neonatal diabetes go away?
In most cases, yes. Most babies stop needing diabetes treatment within the first year of life. However, many children develop diabetes again later, often during adolescence or adulthood. Lifelong follow-up is recommended.
Will my other children get it?
It depends on the specific genetic change causing the condition. Some changes are inherited in a way that gives each future child a chance of having it. A genetic counselor can help families understand their specific risk.
Can it be found before birth?
Sometimes. Babies with this condition may grow slowly before birth. A doctor may notice this on prenatal ultrasound, a scan that uses sound waves to create pictures of the baby. Genetic testing after birth confirms the diagnosis.
Is this the same as type 1 diabetes?
No. Type 1 diabetes is a lasting condition where the immune system attacks the cells that make insulin. Transient neonatal diabetes is caused by gene changes and usually goes away in infancy. Diabetes can return later in life, though.
Sources
- NIH Genetic and Rare Diseases Information Center - Diabetes mellitus, transient neonatal, 1
- MedlinePlus Genetics - 6q24-related transient neonatal diabetes mellitus
- National Institute of Diabetes and Digestive and Kidney Diseases - Monogenic Diabetes (MODY & Neonatal Diabetes Mellitus)
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
