What Causes Clubfoot In Pregnancy?

Clubfoot is one of the most common birth differences in the world, affecting roughly 1 in every 1,000 babies born. The most important thing to understand is that in the large majority of cases, clubfoot is not caused by anything a mother did or did not do during pregnancy. It is a structural condition that develops before birth, and in most babies it occurs with no identifiable cause at all.

Clubfoot — known medically as congenital talipes equinovarus — is a condition where a baby is born with one or both feet turned inward and downward. The tendons, muscles, and bones in the affected foot are positioned in a way that makes the foot difficult to move into a normal position. It is not painful for a newborn, and it is not a sign that anything is wrong with the baby’s brain or nerves in most cases.

What Causes Clubfoot In Pregnancy?

In most cases, the exact cause is unknown. Doctors call this idiopathic clubfoot, and it accounts for the majority of diagnoses. The foot begins forming abnormally during the first trimester of pregnancy, when the tendons and muscles in the leg and foot are developing. Something in that developmental process goes off course, but researchers have not been able to pinpoint a single trigger.

What they do know is that clubfoot is not a positioning problem. It is not caused by the baby simply being squished in the womb. It is a genuine structural difference in how the foot and the tissues around it formed.

There is a strong genetic component. Babies with a family history of clubfoot are more likely to be born with it, and identical twins are more likely to both have it than fraternal twins. That pattern points to genes playing a real role. But no single gene has been identified as the cause, and most babies with clubfoot have no family history at all.

Researchers have looked at many possible environmental factors. Some evidence suggests that maternal smoking during pregnancy is associated with a higher risk. So is a maternal history of certain infections or conditions. But association is not the same as causation, and even when a risk factor is present, it does not mean it caused the clubfoot in any individual case.

Is Clubfoot Genetic?

Genetics plays a role, but it is not the whole story. Clubfoot tends to run in families, and having a parent or sibling with clubfoot does increase the chance a baby will have it. However, the inheritance pattern is complex. It does not follow a simple dominant or recessive pattern like eye color or some single-gene disorders.

What this means practically: if you or your partner had clubfoot, your baby has a higher chance of being born with it, but that chance is still low. Most parents with a history of clubfoot have babies without it. Most babies with clubfoot have no family history.

Some research suggests that certain gene variations involved in muscle and tendon development may contribute. But identifying a specific gene that causes clubfoot in the general population has not been achieved. The condition appears to result from a combination of genetic susceptibility and developmental factors that are not fully understood.

Can Anything During Pregnancy Cause Clubfoot?

This is where honest information matters most. In the overwhelming majority of cases, nothing a mother did caused her baby’s clubfoot. Parents often carry guilt about this, and that guilt is not supported by the evidence.

That said, some factors have been studied as possibly increasing risk. These include:

• Smoking during pregnancy — some studies have found an association, though the evidence is not definitive
• Certain maternal infections during pregnancy
• Diabetes in the mother, particularly if poorly controlled
• Use of certain medications during pregnancy — this varies by drug and should always be discussed with a doctor
• Oligohydramnios, a condition where there is too little amniotic fluid

These are associations found in research, not proven causes. Many women with these risk factors have babies without clubfoot, and many women with none of them have babies with clubfoot. The presence of a risk factor does not establish cause.

What is clear is that clubfoot is not caused by something a mother ate, how much she exercised, whether she took prenatal vitamins, or how she slept. There is no evidence supporting those claims.

What Is The Difference Between Isolated And Complex Clubfoot?

Clubfoot is described in two broad categories, and the distinction matters for understanding cause and outlook.

Isolated clubfoot means the baby has clubfoot and no other health conditions. This is the most common type, and in these cases, the cause is usually unknown. The foot difference is the only issue.

Complex or syndromic clubfoot means the baby has clubfoot along with other health conditions or birth differences. This type is more likely to have an identifiable underlying cause, such as a genetic syndrome or a neuromuscular condition like spina bifida. When clubfoot appears alongside other findings, doctors often look more carefully for a root cause.

This distinction is important because it affects how doctors approach testing, treatment, and what parents can expect. Isolated clubfoot generally has a very good outlook with treatment. Complex clubfoot may require a broader care plan depending on what other conditions are present.

How Is Clubfoot Diagnosed During Pregnancy?

Clubfoot can sometimes be seen on a routine ultrasound, usually during the second trimester. However, it is not always detected before birth. The position of the baby, the amount of amniotic fluid, and the skill of the person performing the ultrasound all affect whether it is visible.

When clubfoot is seen on ultrasound, doctors may recommend additional imaging or testing to check for other conditions. This is because clubfoot can sometimes be a marker for a broader syndrome. In many cases, though, the clubfoot is isolated and no other findings appear.

It is important to know that an ultrasound finding of clubfoot is not always accurate. In some cases, what looks like clubfoot on imaging turns out to be a normal foot position at birth. In other cases, the diagnosis is confirmed after delivery.

Does Clubfoot Affect The Baby’s Health Long-Term?

For isolated clubfoot, the long-term outlook is generally good. With proper treatment, most children are able to walk, run, and play without significant limitations. The foot may always look a little different or be slightly smaller than the other foot, but function is usually not severely affected.

The standard treatment is the Ponseti method, which involves gentle stretching and casting of the foot, usually starting in the first weeks of life. This is followed by a period of bracing to maintain the correction. The Ponseti method has been widely studied and is considered the standard of care for most cases of isolated clubfoot.

Some children need additional procedures, such as a small tendon release, but this is common and does not usually change the overall outlook. Long-term studies show that most people treated for clubfoot as infants have good function as adults, though some may experience foot stiffness or mild discomfort later in life.

Complex clubfoot, where other conditions are present, has a more variable outlook depending on the underlying cause.

What Does Not Cause Clubfoot

There is a lot of misinformation about clubfoot, and it is worth addressing directly. Clubfoot is not caused by:

• The baby’s position in the womb
• Something the mother ate or drank during pregnancy
• Stress or emotional factors during pregnancy
• Prenatal vitamin use or lack of use
• Exercise during pregnancy
• Ultrasound or other routine prenatal care

No study has confirmed any of these as causes. Parents who hear otherwise should know that the science does not support those claims.