Polydactyly (Extra Fingers or Toes) in Babies
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, NIH, CDC guidelines
Last reviewed:
Your baby's physical development is unique, and concerns about polydactyly (extra fingers or toes) in babies, here is what you need to know.
The short answer
Polydactyly (having extra fingers or toes) is one of the most common congenital hand and foot differences, occurring in about 1 in every 500-1000 births. It can range from a small, soft nub of tissue to a fully formed extra digit with bones and joints. In many cases, it is an isolated finding with no other health concerns and runs in families. Treatment depends on the complexity of the extra digit and is usually straightforward.
Key takeaways
- Polydactyly (having extra fingers or toes) is one of the most common congenital hand and foot differences, occurring in about 1 in every 500-1000 births. It can range from a small, soft nub of tissue to a fully formed extra digit with bones and joints. In many cases, it is an isolated finding with no other health concerns and runs in families. Treatment depends on the complexity of the extra digit and is usually straightforward.
- Usually normal when: A small, soft extra digit on the pinky side of the hand, especially if it runs in the family
- Call your doctor if: The extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems
- Varies by age — see the age-by-age breakdown below
“Supervised tummy time is recommended daily from the time the baby comes home from the hospital to help prevent flat head syndrome and to strengthen neck and shoulder muscles.”
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What Parents Should Know
According to AAP, NIH, CDC guidelines, polydactyly (having extra fingers or toes) is one of the most common congenital hand and foot differences, occurring in about 1 in every 500-1000 births. It can range from a small, soft nub of tissue to a fully formed extra digit with bones and joints. In many cases, it is an isolated finding with no other health concerns and runs in families. Treatment depends on the complexity of the extra digit and is usually straightforward. At Newborn, extra digits are typically noticed at birth. The most common type is postaxial polydactyly (an extra small digit on the pinky side of the hand or the little toe side of the foot), which is very common in certain populations and is usually a simple, isolated finding. Preaxial polydactyly (on the thumb or big toe side) is less common and may warrant additional evaluation. Your pediatrician will assess whether the extra digit has bones, blood supply, and nerve connections. It is generally considered normal when a small, soft extra digit on the pinky side of the hand, especially if it runs in the family. However, you should contact your pediatrician promptly if the extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems.
Normal vs. Concerning
By Age
What to expect by age
Newborn
Extra digits are typically noticed at birth. The most common type is postaxial polydactyly (an extra small digit on the pinky side of the hand or the little toe side of the foot), which is very common in certain populations and is usually a simple, isolated finding. Preaxial polydactyly (on the thumb or big toe side) is less common and may warrant additional evaluation. Your pediatrician will assess whether the extra digit has bones, blood supply, and nerve connections.
0-6 months
If the extra digit is a small, soft nub without bone (called a rudimentary or vestigial digit), it may be removed in the nursery or at a pediatric visit with a simple procedure. If the extra digit contains bones, tendons, or joints, your baby will likely be referred to a pediatric hand surgeon or orthopedic specialist to plan a more involved procedure, usually performed between 6 months and 2 years of age.
6 months - 3 years
Surgical removal of a more complex extra digit is typically done during this window, before the child develops fine motor skills that depend on hand function. The surgery is usually outpatient and recovery is straightforward. For extra toes, surgery may be done later or sometimes not at all if the toe does not cause problems with shoe fitting or walking. Long-term outcomes are excellent.
What to Tell Your Pediatrician
- Describe when you first noticed polydactyly (extra fingers or toes) in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby has an extra finger or toe and you want to discuss treatment options and timing.
- Mention if the extra digit appears to have bone, joint movement, or a nail.
- 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
- A small, soft extra digit on the pinky side of the hand, especially if it runs in the family
- An extra toe that does not interfere with shoe fitting or walking
- The extra digit having no bones (a soft tissue tag) that can be addressed with a simple procedure
- Family history of polydactyly, as it is often inherited
- Your baby has an extra finger or toe and you want to discuss treatment options and timing
- The extra digit appears to have bone, joint movement, or a nail
- You notice any other differences in your baby's hands, feet, or other body parts
- You want a referral to a pediatric hand or orthopedic specialist
- The extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems
- There is a thread, hair, or string wrapped around the base of the digit causing swelling
- The extra digit bleeds, becomes infected, or has an open wound
- Your baby has multiple extra digits or other unusual physical findings alongside polydactyly, which may warrant genetic evaluation
What You Can Do at Home
- Keep track of when you notice polydactyly (extra fingers or toes) in babies — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a small, soft extra digit on the pinky side of the hand, especially if it runs in the family — this is generally within the range of normal.
- At Newborn, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Provide plenty of supervised floor time and tummy time to support your baby's physical development.
- While monitoring at home, seek immediate care if the extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems.
Related Conditions
Baby Hip Dysplasia (Hip Click)
Developmental dysplasia of the hip (DDH) is a condition where the hip joint does not form properly, ranging from mild looseness to complete dislocation. It occurs in about 1 in 1,000 births and is more common in firstborns, girls, breech babies, and those with a family history. When caught early, treatment with a soft brace (Pavlik harness) is highly effective.
My Baby Was Born with Clubfoot
Clubfoot (talipes equinovarus) is a condition where one or both feet are turned inward and downward at birth. It affects about 1 in 1,000 babies and is very treatable. The Ponseti method, which uses gentle casting and bracing, corrects clubfoot in over 95% of cases without major surgery. Treatment typically starts within the first few weeks of life for best results.
Baby Birthmarks
Birthmarks are extremely common -- more than 80% of babies have at least one. Most birthmarks are completely harmless and many fade or disappear on their own over time. The type, location, and any changes over time help your pediatrician determine whether any follow-up is needed.
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
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 polydactyly (extra fingers or toes) in babies normal?
When should I call the doctor about polydactyly (extra fingers or toes) in babies?
When is polydactyly (extra fingers or toes) in babies normal?
What causes polydactyly (extra fingers or toes) in babies?
What should I mention to my pediatrician about polydactyly (extra fingers or toes) in babies?
Is polydactyly (extra fingers or toes) in babies normal at Newborn?
Is polydactyly (extra fingers or toes) in babies normal at 0-6 months?
Should I go to the ER for polydactyly (extra fingers or toes) in babies?
Does polydactyly (extra fingers or toes) in babies go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Polydactyly (Extra Fingers or Toes) in Babies.
Things to mention
- Describe when you first noticed polydactyly (extra fingers or toes) in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby has an extra finger or toe and you want to discuss treatment options and timing.
- Mention if the extra digit appears to have bone, joint movement, or a nail.
- 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
- Your baby has an extra finger or toe and you want to discuss treatment options and timing
- The extra digit appears to have bone, joint movement, or a nail
- You notice any other differences in your baby's hands, feet, or other body parts
Urgent signs to report immediately
- The extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems
- There is a thread, hair, or string wrapped around the base of the digit causing swelling
- The extra digit bleeds, becomes infected, or has an open wound
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of polydactyly (extra fingers or toes) in babies are normal. Talk to your pediatrician if the extra digit changes color (turns blue, white, or dark), which could indicate blood flow problems.
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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Related Physical Concerns
Baby Hip Dysplasia (Hip Click)
Developmental dysplasia of the hip (DDH) is a condition where the hip joint does not form properly, ranging from mild looseness to complete dislocation. It occurs in about 1 in 1,000 births and is more common in firstborns, girls, breech babies, and those with a family history. When caught early, treatment with a soft brace (Pavlik harness) is highly effective.
My Baby Was Born with Clubfoot
Clubfoot (talipes equinovarus) is a condition where one or both feet are turned inward and downward at birth. It affects about 1 in 1,000 babies and is very treatable. The Ponseti method, which uses gentle casting and bracing, corrects clubfoot in over 95% of cases without major surgery. Treatment typically starts within the first few weeks of life for best results.
Baby Birthmarks
Birthmarks are extremely common -- more than 80% of babies have at least one. Most birthmarks are completely harmless and many fade or disappear on their own over time. The type, location, and any changes over time help your pediatrician determine whether any follow-up is needed.
Should I Use Adjusted Age for My Preemie's Milestones?
Yes — for premature babies, developmental milestones should be assessed using adjusted (corrected) age, not chronological age, until at least 2 years of age. Adjusted age is calculated by subtracting the number of weeks your baby was born early from their actual age. For example, a 6-month-old born 2 months early would have an adjusted age of 4 months, and should be assessed against 4-month milestones. Most pediatricians use adjusted age for developmental assessment through age 2-3, and for growth charts through age 2.
Baby-Proofing a Small Apartment
Baby-proofing a small apartment is absolutely possible and focuses on the same key safety principles as any home: securing furniture to walls, covering outlets, locking cabinets with hazardous materials, and ensuring safe sleep spaces. Small spaces actually have an advantage - there is less area to monitor. Focus on eliminating the most dangerous hazards first: falls, poisoning, choking, and burns.
My Baby Seems to Use One Side More Than the Other
Babies should use both sides of their body fairly equally during the first 18 months of life. While slight preferences can be normal, a consistent pattern of favoring one side - using one arm much more than the other, crawling with one leg dragging, or turning the head predominantly one way - should always be discussed with your pediatrician. Early identification of asymmetry leads to the best outcomes.