Medical Conditions

My Baby Has a Lump in the Middle of Their Neck (Thyroglossal Duct Cyst)

Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist

Content reviewed against published AAP, Mayo Clinic, NIH guidelines

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If your baby has been diagnosed with or you suspect has a lump in the middle of their neck (thyroglossal duct cyst), here is what the evidence says.

The short answer

A thyroglossal duct cyst is the most common congenital midline neck mass in children. It appears as a painless, round lump in the middle of the neck, usually near or below the hyoid bone (the bone you can feel at the base of the tongue area). It characteristically moves upward when the child swallows or sticks out their tongue. While usually harmless, surgical removal is recommended because these cysts can become infected.

Key takeaways

  • A thyroglossal duct cyst is the most common congenital midline neck mass in children. It appears as a painless, round lump in the middle of the neck, usually near or below the hyoid bone (the bone you can feel at the base of the tongue area). It characteristically moves upward when the child swallows or sticks out their tongue. While usually harmless, surgical removal is recommended because these cysts can become infected.
  • Usually normal when: A small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst
  • Call your doctor if: The cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst)
  • Varies by age — see the age-by-age breakdown below
“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”
— Fever and Your Child, American Academy of Pediatrics (AAP)

This is one of the most common questions parents ask. Searching for answers means you care.

What Parents Should Know

According to AAP, Mayo Clinic, NIH guidelines, a thyroglossal duct cyst is the most common congenital midline neck mass in children. It appears as a painless, round lump in the middle of the neck, usually near or below the hyoid bone (the bone you can feel at the base of the tongue area). It characteristically moves upward when the child swallows or sticks out their tongue. While usually harmless, surgical removal is recommended because these cysts can become infected. At 0-3 months, thyroglossal duct cysts may be noticed at birth or within the first few months. The cyst forms from a remnant of the duct through which the thyroid gland descends during fetal development. It typically presents as a painless, smooth, mobile midline neck lump. Your pediatrician will likely order an ultrasound to confirm the diagnosis and check thyroid position. It is generally considered normal when a small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst. However, you should contact your pediatrician promptly if the cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst).

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
A small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst
The cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst)
The lump moves upward when your baby swallows or sticks out their tongue
The lump is growing rapidly, is hard, or is not mobile
Your pediatrician is monitoring the cyst and has discussed timing of surgery
You notice a new midline neck lump in your baby

By Age

What to expect by age

0-3 months

Thyroglossal duct cysts may be noticed at birth or within the first few months. The cyst forms from a remnant of the duct through which the thyroid gland descends during fetal development. It typically presents as a painless, smooth, mobile midline neck lump. Your pediatrician will likely order an ultrasound to confirm the diagnosis and check thyroid position.

3-12 months

The cyst may become more noticeable as your baby grows. It is usually discovered incidentally or when it becomes infected and suddenly enlarges. An infected thyroglossal duct cyst becomes red, swollen, and tender and needs antibiotic treatment. After infection resolves, surgical removal is typically recommended to prevent recurrence.

12-24 months

If not previously noticed, a thyroglossal duct cyst may become apparent in toddlerhood. Surgery (Sistrunk procedure) is the definitive treatment and involves removing the cyst, the duct tract, and the central portion of the hyoid bone to prevent recurrence. The surgery has a very high success rate.

2-3 years

If surgery has been recommended, this is a common age for the procedure. It is performed under general anesthesia and typically requires a short hospital stay. Recovery takes about 1-2 weeks. Without surgery, the cyst may continue to grow or become recurrently infected.

3-5 years

Some thyroglossal duct cysts are not discovered until preschool age. The same treatment approach applies. Before surgery, an ultrasound confirms that normal thyroid tissue exists in the usual position, as rarely the only thyroid tissue a child has may be within the cyst.

What to Tell Your Pediatrician

  • Describe when you first noticed has a lump in the middle of their neck (thyroglossal duct cyst) and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if you notice a new midline neck lump in your baby.
  • Mention if a previously stable cyst seems to be growing.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • A small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst
  • The lump moves upward when your baby swallows or sticks out their tongue
  • Your pediatrician is monitoring the cyst and has discussed timing of surgery
Mention at your next visit when...
  • You notice a new midline neck lump in your baby
  • A previously stable cyst seems to be growing
  • You want to discuss timing and details of surgical removal
Act now when...
  • The cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst)
  • The lump is growing rapidly, is hard, or is not mobile

What You Can Do at Home

  • Keep track of when you notice has a lump in the middle of their neck (thyroglossal duct cyst) — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that a small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst — this is generally within the range of normal.
  • At 0-3 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
  • While monitoring at home, seek immediate care if the cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst).

My Baby Has a Lump on the Side of Their Neck (Branchial Cleft Cyst)

A branchial cleft cyst is a congenital lump that appears on the side of the neck, usually along the front edge of the sternocleidomastoid muscle. It develops from remnants of embryonic structures (branchial arches) that did not fully resolve during fetal development. The cyst is typically painless and may be noticed at birth or later in childhood, often when it becomes infected. Surgical removal is the recommended treatment.

My Baby Has Swollen Lymph Nodes in Their Neck

Swollen neck lymph nodes (cervical lymphadenopathy) are extremely common in babies and young children and are almost always caused by routine infections like colds, ear infections, or throat infections. Neck nodes up to 1 cm are generally considered normal in children. They may enlarge during infections and take weeks to return to normal size. Most are harmless, but nodes that are very large, hard, fixed, or associated with other concerning symptoms need evaluation.

When Should My Baby See a Pediatric ENT?

A pediatric ENT (otolaryngologist) specializes in ear, nose, and throat conditions in children. Common reasons for referral include recurrent ear infections (3+ in 6 months or 4+ in a year), hearing loss, chronic ear fluid, enlarged tonsils or adenoids causing sleep or breathing problems, stridor, chronic sinusitis, airway abnormalities, and neck masses. These specialists can perform ear tube surgery, tonsillectomy, adenoidectomy, and airway evaluations.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is has a lump in the middle of their neck (thyroglossal duct cyst) normal?
A thyroglossal duct cyst is the most common congenital midline neck mass in children. It appears as a painless, round lump in the middle of the neck, usually near or below the hyoid bone (the bone you can feel at the base of the tongue area). It characteristically moves upward when the child swallows or sticks out their tongue. While usually harmless, surgical removal is recommended because these cysts can become infected.
When should I call the doctor about has a lump in the middle of their neck (thyroglossal duct cyst)?
The cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst) The lump is growing rapidly, is hard, or is not mobile
When is has a lump in the middle of their neck (thyroglossal duct cyst) normal?
A small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst The lump moves upward when your baby swallows or sticks out their tongue Your pediatrician is monitoring the cyst and has discussed timing of surgery
What causes has a lump in the middle of their neck (thyroglossal duct cyst)?
A thyroglossal duct cyst is the most common congenital midline neck mass in children. It appears as a painless, round lump in the middle of the neck, usually near or below the hyoid bone (the bone you can feel at the base of the tongue area). It characteristically moves upward when the child swallows or sticks out their tongue. While usually harmless, surgical removal is recommended because these cysts can become infected. Common explanations include: A small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst. The lump moves upward when your baby swallows or sticks out their tongue.
What should I mention to my pediatrician about has a lump in the middle of their neck (thyroglossal duct cyst)?
You should mention has a lump in the middle of their neck (thyroglossal duct cyst) at your next visit if: You notice a new midline neck lump in your baby. A previously stable cyst seems to be growing. You want to discuss timing and details of surgical removal.
Is has a lump in the middle of their neck (thyroglossal duct cyst) normal at 0-3 months?
Thyroglossal duct cysts may be noticed at birth or within the first few months. The cyst forms from a remnant of the duct through which the thyroid gland descends during fetal development. It typically presents as a painless, smooth, mobile midline neck lump. Your pediatrician will likely order an ultrasound to confirm the diagnosis and check thyroid position.
Is has a lump in the middle of their neck (thyroglossal duct cyst) normal at 3-12 months?
The cyst may become more noticeable as your baby grows. It is usually discovered incidentally or when it becomes infected and suddenly enlarges. An infected thyroglossal duct cyst becomes red, swollen, and tender and needs antibiotic treatment. After infection resolves, surgical removal is typically recommended to prevent recurrence.
Should I go to the ER for has a lump in the middle of their neck (thyroglossal duct cyst)?
Seek emergency care if the cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst), or if the lump is growing rapidly, is hard, or is not mobile. When in doubt, call your pediatrician's after-hours line for guidance.
Does has a lump in the middle of their neck (thyroglossal duct cyst) go away on its own?
In many cases, has a lump in the middle of their neck (thyroglossal duct cyst) resolves on its own, especially when a small, stable, painless midline neck lump that has been evaluated and diagnosed as a thyroglossal duct cyst. By 3-5 years, some thyroglossal duct cysts are not discovered until preschool age. The same treatment approach applies. Before surgery, an ultrasound confirms that normal thyroid tissue exists in the usual position, as rarely the only thyroid tissue a child has may be within the cyst.
AAPMAYO CLINICNIH

References

  1. [1]American Academy of Pediatrics. Neck Masses in Children. Pediatrics in Review. AAP
  2. [2]Mayo Clinic. Thyroglossal duct cyst. Mayo Clinic
  3. [3]National Library of Medicine. Thyroglossal Duct Cyst. StatPearls. NIH

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss My Baby Has a Lump in the Middle of Their Neck (Thyroglossal Duct Cyst).

Things to mention

  • Describe when you first noticed has a lump in the middle of their neck (thyroglossal duct cyst) and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if you notice a new midline neck lump in your baby.
  • Mention if a previously stable cyst seems to be growing.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • You notice a new midline neck lump in your baby
  • A previously stable cyst seems to be growing
  • You want to discuss timing and details of surgical removal

Urgent signs to report immediately

  • The cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst)
  • The lump is growing rapidly, is hard, or is not mobile

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

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Bottom line

Most cases of has a lump in the middle of their neck (thyroglossal duct cyst) are normal. Talk to your pediatrician if the cyst becomes suddenly red, swollen, warm, tender, or your baby develops fever (infected cyst).

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

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My Baby Has a Lump on the Side of Their Neck (Branchial Cleft Cyst)

A branchial cleft cyst is a congenital lump that appears on the side of the neck, usually along the front edge of the sternocleidomastoid muscle. It develops from remnants of embryonic structures (branchial arches) that did not fully resolve during fetal development. The cyst is typically painless and may be noticed at birth or later in childhood, often when it becomes infected. Surgical removal is the recommended treatment.

My Baby Has Swollen Lymph Nodes in Their Neck

Swollen neck lymph nodes (cervical lymphadenopathy) are extremely common in babies and young children and are almost always caused by routine infections like colds, ear infections, or throat infections. Neck nodes up to 1 cm are generally considered normal in children. They may enlarge during infections and take weeks to return to normal size. Most are harmless, but nodes that are very large, hard, fixed, or associated with other concerning symptoms need evaluation.

When Should My Baby See a Pediatric ENT?

A pediatric ENT (otolaryngologist) specializes in ear, nose, and throat conditions in children. Common reasons for referral include recurrent ear infections (3+ in 6 months or 4+ in a year), hearing loss, chronic ear fluid, enlarged tonsils or adenoids causing sleep or breathing problems, stridor, chronic sinusitis, airway abnormalities, and neck masses. These specialists can perform ear tube surgery, tonsillectomy, adenoidectomy, and airway evaluations.

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