Overview
Isolated congenital hypoglossia is a very rare condition present from birth in which a baby is born with an unusually small tongue, or in some cases, a tongue that is almost completely absent. The word 'hypoglossia' comes from Greek roots meaning 'under' and 'tongue.' Unlike some other tongue abnormalities that occur alongside other birth differences, the 'isolated' form means the small tongue is the main or only finding — other parts of the body are typically not affected. The tongue plays a central role in feeding, swallowing, speaking, and even the normal development of the jaw and teeth. Because of this, babies and children with isolated congenital hypoglossia often face challenges with breastfeeding or bottle feeding right from birth, and may later have difficulty with speech and eating solid foods. The roof of the mouth and the alignment of the teeth can also be affected over time because the tongue normally helps shape these structures as a child grows. With early support from a team of specialists — including speech therapists, feeding specialists, and dental experts — many children can learn to adapt and develop good communication and eating skills. Treatment is focused on managing symptoms and supporting development, as there is currently no way to grow a larger tongue. The outlook for most children is generally positive with the right support in place.
Key symptoms:
Abnormally small tongue present from birthDifficulty breastfeeding or bottle feeding as a newbornTrouble swallowing food or liquidsDelayed or unclear speech developmentDifficulty moving food around the mouthProblems with chewing solid foodsDental misalignment or crowding of teethNarrow or high-arched roof of the mouthDrooling due to poor tongue controlDifficulty sticking the tongue out past the lips
Sporadic
Usually appears on its own, not inherited from a parent
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Isolated congenital hypoglossia.
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Specialists
View all specialists →No specialists are currently listed for Isolated congenital hypoglossia.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Isolated congenital hypoglossia.
Community
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Caregiver Resources
NORD Caregiver Resources
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Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What specialists should be part of my child's care team, and how soon should we see them?,What feeding techniques or tools are recommended for my newborn right now?,When should we start speech therapy, and what should we expect from it?,Will my child's jaw and teeth be affected, and how do we monitor that?,Is genetic testing recommended for our family, and what might it tell us?,Are there any surgical options that might help my child in the future?,Where can I find other families or support groups dealing with this condition?
Common questions about Isolated congenital hypoglossia
What is Isolated congenital hypoglossia?
Isolated congenital hypoglossia is a very rare condition present from birth in which a baby is born with an unusually small tongue, or in some cases, a tongue that is almost completely absent. The word 'hypoglossia' comes from Greek roots meaning 'under' and 'tongue.' Unlike some other tongue abnormalities that occur alongside other birth differences, the 'isolated' form means the small tongue is the main or only finding — other parts of the body are typically not affected. The tongue plays a central role in feeding, swallowing, speaking, and even the normal development of the jaw and teeth. B
How is Isolated congenital hypoglossia inherited?
Isolated congenital hypoglossia follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Isolated congenital hypoglossia typically begin?
Typical onset of Isolated congenital hypoglossia is neonatal. Age of onset can vary across affected individuals.