When Does Clubfoot Appear? The Complete Detection Timeline
If you're wondering when does clubfoot appear, the answer is that clubfoot develops early in pregnancy — typically between the 9th and 14th week of gestation — and is present from birth. However, the point at which it's detected varies. Some cases are picked up on prenatal ultrasound scans, while others are first noticed at the newborn examination after birth. This guide explains the complete detection timeline, from early pregnancy through to postnatal diagnosis.
Understanding when clubfoot appears and is detected can help you feel prepared, whether you're currently pregnant and have concerns, or your baby has just been diagnosed. For a comprehensive overview of the condition, see our clubfoot parent guide.
When Does Clubfoot Develop in the Womb?
Clubfoot (congenital talipes equinovarus) develops during early foetal development, typically during the first trimester of pregnancy:
Weeks 4–8: Limb Bud Formation
The baby's limbs begin forming as small "buds" from around week 4 of pregnancy. By week 8, the basic structure of the feet — including bones, muscles, tendons, and blood vessels — has started to take shape.
Weeks 9–14: The Critical Period
This is when clubfoot is thought to develop. During this period, the foot is normally in an equinovarus position (turned inward and downward) as a natural part of development. In most babies, the foot rotates into a normal position as development continues. In babies with clubfoot, this rotation doesn't occur completely, and the foot remains in the turned position.
Research suggests that the development of clubfoot involves a combination of factors during this period — including genetic influences, differences in muscle and connective tissue development, and the mechanical environment within the uterus. For a detailed exploration of causes, see our articles on what causes clubfoot and what causes clubfoot during pregnancy.
Weeks 14–20: Foot Position Established
By week 14–16, the clubfoot deformity is established. The foot is in its characteristic equinovarus position, and as the baby grows, the surrounding soft tissues (tendons, ligaments, joint capsules) adapt to this position, making it progressively more rigid.
When Is Clubfoot First Detected?
Prenatal Detection: The 20-Week Anomaly Scan
In the UK, all pregnant women are offered a detailed anomaly scan at around 18–21 weeks of pregnancy (commonly called the 20-week scan). This scan checks the baby's development, including the position of the feet.
Clubfoot can sometimes be detected at this scan. The sonographer looks at the position of the feet in relation to the lower legs. Signs that suggest clubfoot include:
- The sole of the foot visible in the same view as the lower leg bones (normally, the sole faces downward and isn't visible in this view)
- The foot appearing to be turned inward at a sharp angle
- The foot remaining in an unusual position across multiple views
Prenatal Detection Rates
The detection rate for clubfoot on prenatal ultrasound varies significantly:
- Overall detection rate: Approximately 60–80% of clubfoot cases are identified on the 20-week scan in specialist centres
- General screening detection: Rates may be lower (40–60%) in non-specialist settings
- Bilateral clubfoot: Easier to detect than unilateral, as both feet are affected
- Severe cases: More likely to be detected than mild cases
It's important to understand that a normal 20-week scan does not guarantee that clubfoot is absent. Some cases are missed, particularly mild ones or when the baby is positioned in a way that makes the feet difficult to visualise. Equally, a suspected clubfoot on scan may turn out to be positional talipes that resolves before birth.
For detailed information about what happens when clubfoot is detected prenatally, see our prenatal clubfoot diagnosis guide.
Additional Prenatal Scans
If clubfoot is suspected at the 20-week scan, you may be offered:
- A repeat scan at 28–32 weeks to confirm the diagnosis
- A detailed scan to check for associated conditions — in about 80% of cases, clubfoot occurs in isolation, but in 20% it may be associated with other conditions
- Amniocentesis — in some cases, particularly if other anomalies are suspected, genetic testing may be offered
Postnatal Detection: The Newborn Examination
All babies born in the UK receive a thorough newborn physical examination (also called the NIPE — Newborn and Infant Physical Examination) within 72 hours of birth. This examination includes a careful check of the feet and is when many clubfoot cases are first identified.
The examining doctor or midwife will:
- Observe the foot's resting position: A clubfoot will be visibly turned inward and downward
- Assess flexibility: The examiner will try to gently move the foot to a normal position. In true clubfoot (structural talipes equinovarus), the foot is rigid and resists correction. In positional talipes, the foot is flexible and easily moves
- Look for associated features: Deep skin creases on the sole or behind the ankle, a smaller foot/calf, and other signs that suggest structural rather than positional deformity
- Check for other conditions: A thorough head-to-toe examination helps identify any associated conditions
The Pirani Assessment
Once clubfoot is identified, the specialist will use the Pirani scoring system to grade its severity. This involves assessing six clinical signs, each scored 0, 0.5, or 1, giving a total score between 0 (fully corrected) and 6 (most severe). The Pirani score helps guide treatment expectations and is tracked at each appointment to monitor progress.
Can Clubfoot Appear Later in Life?
True congenital clubfoot (CTEV) is present from birth — it cannot "develop" or "appear" later. However, some related conditions can cause a foot to turn inward after birth:
- Relapse after treatment: A previously corrected clubfoot can relapse, particularly if bracing isn't followed. This typically occurs in the first 4 years of life. See our guide on relapse signs
- Neuromuscular clubfoot: Some neurological conditions (e.g., cerebral palsy, spina bifida) can cause the foot to develop an equinovarus position after birth as muscle imbalance progresses
- Post-traumatic deformity: Injury or surgery to the foot or leg can sometimes result in a clubfoot-like position
These acquired forms are different from congenital clubfoot and may require different treatment approaches.
Early Detection Benefits
Detecting clubfoot as early as possible — ideally prenatally or at birth — offers several advantages:
- Earlier treatment: Treatment can begin within the first two weeks of life, when tissues are most pliable and responsive to the Ponseti method
- Fewer casts needed: Babies treated in the first week often need fewer casts than those treated later
- Parental preparation: Prenatal diagnosis gives parents time to learn about the condition, meet the specialist team, and prepare emotionally before their baby arrives
- Screening for associated conditions: Early detection allows time to investigate whether the clubfoot is isolated or part of a broader condition
- Better outcomes: Research consistently shows that early treatment is associated with better long-term results
What If Clubfoot Wasn't Detected Before Birth?
Don't worry if your baby's clubfoot wasn't picked up on the 20-week scan. This is common — not all cases are visible on ultrasound, and detection depends on many factors including the baby's position, the equipment used, and the sonographer's experience.
The newborn examination is specifically designed to catch conditions like clubfoot. Once identified, your baby will be referred urgently to a specialist clubfoot clinic. The NHS referral pathway ensures that treatment begins within the first two weeks of life.
The outcomes for babies diagnosed at birth are just as good as for those diagnosed prenatally — the key is starting treatment promptly once the diagnosis is made.
Frequently Asked Questions
Q: Can clubfoot develop after birth?
A: No, true congenital clubfoot (CTEV) is present from birth and develops during early pregnancy. However, a clubfoot-like deformity can develop later in life due to neurological conditions, muscle imbalance, or trauma. These acquired forms are different from congenital clubfoot and are managed differently.
Q: My 20-week scan was normal — could my baby still have clubfoot?
A: Yes, it's possible. Not all cases of clubfoot are detected on the 20-week scan — the detection rate varies between 40–80% depending on the centre and the specific case. A normal scan significantly reduces the likelihood but doesn't completely rule it out. The newborn examination after birth will check for clubfoot regardless of scan results.
Q: At what week of pregnancy can clubfoot be detected?
A: Clubfoot is typically first detectable on ultrasound from around 18–20 weeks of pregnancy, which is why the 20-week anomaly scan is the primary screening point. Some specialist centres may detect it earlier (from around 16 weeks), but this is less reliable as the foetal feet are still very small and may be in a normal equinovarus position as part of development.
Q: Is there any way to prevent clubfoot from developing?
A: There is currently no known way to prevent clubfoot. It develops early in pregnancy due to a combination of genetic and environmental factors, most of which cannot be controlled. Taking folic acid, not smoking, and following general pregnancy health advice may reduce risk factors, but no specific preventive measure has been proven. See our guide on causes during pregnancy.
Q: Does clubfoot get worse if it's not detected early?
A: The deformity itself doesn't get significantly worse in the womb or in the first few weeks of life. However, delaying treatment allows the tissues to become less pliable, which may mean more casts are needed. The optimal window for starting Ponseti treatment is within the first two weeks of life, but excellent results can still be achieved if treatment starts later — even in older children, though the approach may need to be modified.
Q: Can I feel clubfoot during pregnancy?
A: No, you cannot feel or detect clubfoot through normal pregnancy sensations. It does not affect the baby's movements or cause the mother any unusual symptoms. Detection relies on ultrasound imaging or physical examination after birth.
Q: If clubfoot runs in my family, can it be detected earlier?
A: If you have a family history of clubfoot, you can mention this to your midwife or sonographer. They may pay particular attention to the feet during the 20-week scan. However, there is no earlier genetic test or screening method currently available in routine NHS care. If clubfoot is identified on scan, the referral and preparation process can begin before birth, allowing for the fastest possible start to treatment. Learn more about hereditary factors in our genetic and hereditary guide.
Summary
Clubfoot develops during early pregnancy (weeks 9–14) and is present from birth. It can be detected at the 20-week anomaly scan in 40–80% of cases, or at the newborn physical examination within 72 hours of birth. Early detection allows for prompt treatment with the Ponseti method, which achieves excellent results when started within the first two weeks of life. Whether detected before or after birth, the outcomes for babies treated through the NHS are overwhelmingly positive.