You're not alone.
We've been there too.
If your child was just diagnosed with Poland anomaly — or you're searching because something doesn't look right — you've found the right place. We're a nonprofit built by a Poland family, for Poland families.
What is Poland anomaly?
Poland anomaly is the absence or underdevelopment of the pectoralis major muscle on one side of the chest, often accompanied by differences in the hand and fingers on the same side.
Not genetic. Not your fault.
Poland anomaly is caused by a random disruption to blood flow early in pregnancy. It cannot be predicted, prevented, or passed down. It's nobody's fault.
Read about causes →Rare, but you're not alone.
About 1 in 20,000–30,000 births. Fewer than 150 children per year in the US. It can feel incredibly isolating — which is exactly why this foundation exists.
Learn more →Not life-threatening. Not progressive.
Poland anomaly does not worsen over time and does not affect lifespan. With the right care, people with Poland anomaly live full, active lives.
See treatment options →Use our free symptom checker
Answer a few questions about what you're seeing. Our interactive tool will help identify whether Poland anomaly might explain the symptoms — and tell you exactly what to do next.
Common questions that bring families here:
- 🤔 "Baby born with webbed fingers on one hand"
- 🤔 "Child's chest looks sunken or uneven"
- 🤔 "One breast not growing during puberty"
- 🤔 "Missing chest muscle on one side"
- 🤔 "Small hand with short fingers one side"
Why this foundation matters
The average age of diagnosis is 14 years. Most people — and most doctors — don't recognize Poland anomaly until years of searching.
Find a specialist near you
Our directory lists ~98 physicians and surgical centers across 38 states with documented Poland anomaly experience — from pediatric hand surgeons to chest wall reconstruction specialists.
Connect with other Poland families
Our moderated forum is a place to ask questions, share experiences, and find others who truly understand. Parents, adults with Poland anomaly, and teens all welcome.
Join the Community