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.
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By Age
What to expect by age
0-3 months
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.
3-6 months
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.
6-12 months
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.
12 months+
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
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
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.
How to Advocate for Your Child's Needs
You know your child better than anyone, and your observations matter. If you feel something is not right with your child's development or health, you have every right to ask questions, request evaluations, and seek second opinions. Advocating for your child is not being difficult - it is being a good parent.
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.
Are Allergies Linked to Neurodivergence in Children?
Research has found statistical associations between atopic conditions (eczema, food allergies, asthma) and certain neurodevelopmental differences such as ADHD and autism spectrum disorder. However, having allergies does not mean your child will be neurodivergent, and most children with allergies develop typically. These conditions may share some underlying immune and genetic pathways, but one does not cause the other.