Neuroblastoma Signs in Babies
The short answer
Neuroblastoma is the most common cancer in infants, accounting for about 6-10% of all childhood cancers. It develops from immature nerve cells and most commonly appears as a mass in the abdomen (adrenal gland), chest, neck, or pelvis. About 90% of cases are diagnosed before age 5, with a median age of diagnosis around 18 months. Babies under 1 year have the best prognosis, with many low-risk tumors even regressing on their own without treatment.
By Age
What to expect by age
Neuroblastoma in very young infants may be found incidentally on prenatal ultrasound or during evaluation for another concern. A baby may have a palpable abdominal mass, a firm lump in the neck, or skin nodules that appear as blue-purple "blueberry muffin" spots. In some cases, the tumor is detected because of compression symptoms — difficulty breathing if in the chest, or constipation and urinary issues if in the pelvis. Babies diagnosed under 1 year often have very favorable outcomes.
Signs may include a firm, nontender mass in the abdomen that a parent or doctor feels during a routine exam, protruding eyes (proptosis) with dark circles ("raccoon eyes") if the tumor has spread to the area around the eyes, and general symptoms like irritability and poor feeding. A special form called 4S neuroblastoma occurs in infants under 12 months and may actually spontaneously regress without treatment.
Neuroblastoma may present with an enlarging abdominal mass, fever of unknown origin, bone pain (causing irritability and limping or refusing to bear weight), and sometimes watery diarrhea. Diagnosis involves imaging (ultrasound, CT, MIBG scan), urine tests for catecholamines (VMA/HMA), and biopsy. Babies under 1 year with neuroblastoma generally have the best prognosis among all age groups.
Neuroblastoma diagnosed after age 1 tends to be more aggressive and may require more intensive treatment including chemotherapy, surgery, radiation, and immunotherapy. However, treatment advances have significantly improved survival rates. Low-risk and intermediate-risk neuroblastomas have survival rates above 90%. Even high-risk neuroblastoma has seen improving outcomes with modern multimodal therapy.
What Should You Do?
When to take action
- Your baby was evaluated for a mass and it was found to be benign (such as a normal lymph node or cyst)
- Your baby has small "stork bite" birthmarks or typical newborn skin findings, not blueberry muffin lesions
- Your baby's abdominal exam is normal and soft at well-child visits
- Your baby is growing well, active, and has no unexplained masses or symptoms
- You feel a firm lump or mass in your baby's abdomen, neck, or anywhere on the body
- Your baby has unexplained dark circles around the eyes or protruding eyes
- Your baby has unusual firm blue or purple skin nodules
- Your baby has a rapidly growing abdominal mass with poor feeding, vomiting, or signs of distress
- Your baby has sudden weakness in the legs, difficulty walking, or changes in bladder or bowel function — a spinal tumor may be compressing the spinal cord
Sources
Related Resources
Related Medical Concerns
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
Air Quality and Baby Health
Babies and young children are more vulnerable to air pollution than adults because they breathe faster, their lungs are still developing, and they spend more time close to the ground where some pollutants concentrate. The EPA recommends keeping babies indoors when the Air Quality Index (AQI) exceeds 100 (orange level). During wildfire smoke events, keep windows closed, use air purifiers with HEPA filters, and monitor your child for coughing, wheezing, or difficulty breathing. Long-term exposure to air pollution can affect lung development.
Altitude Sickness in Babies
Babies and toddlers can experience altitude sickness when traveling above 5,000-8,000 feet (1,500-2,500 meters). Symptoms are harder to recognize in infants because they cannot describe how they feel. Watch for unusual fussiness, poor feeding, disrupted sleep, vomiting, and fast breathing. Gradual ascent is the best prevention. Most pediatricians recommend avoiding sleeping at very high altitudes (above 8,000 feet) with infants when possible, and descending immediately if symptoms appear.
Amblyopia (Lazy Eye) Treatment Timing
Amblyopia (lazy eye) is the most common cause of vision loss in children, affecting 2-3% of the population. It occurs when one eye develops weaker vision because the brain favors the other eye. Early detection and treatment are critical because the visual system is most responsive to treatment during early childhood. Treatment is most effective when started before age 7, though improvement is possible at older ages. Treatment options include patching the stronger eye, atropine eye drops, glasses, or a combination.