A DDH diagnosis at the newborn check is unexpected, and the information given at that appointment is often brief. This guide covers what DDH actually is, why it happens, what the Pavlik harness involves day-to-day, what to expect during treatment, and the excellent prognosis for babies diagnosed and treated early.
🦴 Open WiseMama — freeDevelopmental dysplasia of the hip (DDH) describes a range of conditions in which the hip joint does not develop normally. The hip joint is a ball-and-socket joint: the femoral head (the ball at the top of the thigh bone) should sit snugly and centrally in the acetabulum (the socket in the pelvis). In DDH, this relationship is disrupted — the ball may sit too loosely in a shallow socket, partially outside it, or completely dislocated from it.
DDH exists on a spectrum:
Around 1–3% of newborns have some degree of hip instability, though many resolve spontaneously in the first weeks of life. True dislocation — the most severe end of the spectrum — affects approximately 1–2 in 1,000 births. The condition is not painful for a young baby and causes no distress. Left untreated into childhood and adulthood, however, it can cause a limp, leg length discrepancy, and early hip arthritis — which is why early detection and treatment matters so much.
DDH develops through a combination of factors: genetic susceptibility (it runs in families), the effect of maternal hormones (oestrogen and relaxin soften ligaments — helpful for birth but increasing joint laxity in the baby), and mechanical factors (the position of the baby in the womb). None of these are caused by anything the parent did. DDH is a developmental condition, not an injury or neglect.
Several factors are associated with higher DDH risk — knowing these helps explain why some babies are referred for ultrasound even when the newborn examination appears normal.
Girls are four to six times more likely to have DDH than boys. The reason is thought to be ligamentous laxity from maternal oestrogen and relaxin — girls appear to be more sensitive to these hormonal effects, producing greater joint looseness.
Babies in a frank breech position (bottom down, legs extended upward) have a significantly higher risk of DDH — the position places the hip in extension with the legs together, which is mechanically unfavourable for socket development. Extended breech accounts for a substantial proportion of DDH cases. The risk is present regardless of whether delivery was vaginal or by caesarean.
A positive family history of DDH — a parent or sibling who had treatment for DDH — increases the baby's risk by around twelve-fold. This is one of the clinical triggers for referral for hip ultrasound screening even when the examination is normal.
First babies are at modestly higher risk, thought to be due to the tighter, less-stretched uterine and abdominal muscles of a first pregnancy creating more constraint on fetal movement and positioning.
DDH affects the left hip more commonly than the right — a reflection of the typical fetal lie position in the womb (left occiput anterior), which puts the left hip against the mother's sacrum in a position that promotes dislocation. Bilateral DDH occurs in around 20% of cases.
In the UK, every baby receives a structured hip examination as part of the newborn and infant physical examination (NIPE) — at birth and again at 6–8 weeks. The examination looks for signs of instability, and babies with risk factors are referred for hip ultrasound even when examination is normal.
Two clinical tests are performed:
The Ortolani test gently abducts (opens out) the hip while lifting the femoral head upward. A positive Ortolani is a palpable clunk — the sensation of the dislocated femoral head relocating into the socket. This indicates true dislocation.
The Barlow test attempts to provoke dislocation by adducting (bringing in) the hip and applying gentle backward pressure. A positive Barlow is the femoral head being felt to slip out of the socket — indicating a dislocatable hip.
Parents often hear their baby has "clicky hips" after the newborn examination and understandably worry this means DDH. The clinical distinction matters: soft clicks — high-pitched, felt on the surface — are almost always caused by ligamentous laxity, tendons snapping over bony prominences, or simply the looseness of newborn joints. They are common, usually benign, and typically resolve in the first weeks without treatment.
A clunk — a deeper, more definite sensation of the hip joint moving — is clinically significant. Clicks without a positive Ortolani or Barlow, and without risk factors, are usually monitored rather than treated. If you are told your baby has "clicky hips" and are uncertain whether this warrants referral, asking specifically "was that a click or a clunk, and does it require follow-up?" is a reasonable question.
Ultrasound is the primary imaging modality for DDH under five months, as the femoral head is entirely cartilage at this stage and not visible on X-ray. The UK uses selective screening — ultrasound is offered to babies with risk factors (breech, family history) or an abnormal clinical examination, rather than to every baby.
The Graf classification system grades hip morphology from Type I (normal) to Type IV (complete dislocation). A Type IIa is common in newborns and represents immature but normal development — most resolve without treatment. Types IIb, IIc, D, III, and IV are increasingly abnormal and guide treatment decisions.
From approximately four to six months, the femoral head's ossification centre begins to appear and X-ray becomes the primary imaging tool. X-ray is used for older babies, for monitoring treatment, and for assessing surgical cases.
The Pavlik harness is the standard first-line treatment for DDH in babies under approximately six months. If your baby has been referred for a harness, understanding what it does and why makes the weeks ahead considerably more manageable.
The Pavlik harness is a soft fabric harness consisting of shoulder straps, chest straps, and stirrups that hold the legs. It positions the hips in flexion (knees up toward the chest) and abduction (knees apart, like a frog). This position — sometimes called the human position — places the femoral head centrally in the acetabulum and encourages the socket to deepen and stabilise around it as the baby grows. The hip is not held rigidly but allowed to move within the safe range — the harness guides rather than fixes.
The harness is typically worn for 23 hours a day, removed for one hour to allow bathing and gentle exercise of the hips. The exact protocol varies slightly by centre — your orthopaedic team will give you specific instructions for your baby's harness and condition. Most babies adapt within a day or two and are entirely unbothered by it thereafter. The period of adjustment is usually harder for the parents than for the baby.
Your baby will have regular ultrasound checks — typically every 2–4 weeks — to assess hip development and the response to treatment. Duration of harness wear is usually 6–12 weeks, though this varies considerably depending on the initial severity and how the hip responds. Treatment continues until the hip is stable on ultrasound, not to a fixed number of weeks.
For appropriately selected cases — babies under six months with dislocatable or subluxing hips — the Pavlik harness achieves successful stabilisation in approximately 85–95% of cases. Success rates are highest when treatment begins early (in the first weeks of life) and for less severe presentations. For true complete dislocations, success rates are lower and the management protocol is more carefully supervised.
In rare cases, incorrect application of the Pavlik harness for a true high dislocation can lead to a complication called Pavlik disease — where continued harness use in the wrong position damages the femoral head or acetabulum. This is why Pavlik harness treatment for complete dislocations is managed carefully with very frequent review. It is not a risk for families following their orthopaedic team's protocol correctly — it is a reason why professional fitting and supervision matters.
The practicalities of caring for a baby in a Pavlik harness are often what parents most need help with, and what is least covered in clinical appointments. Most things are entirely possible — they just need a small adjustment.
Nappy changes can be done with the harness on. The hips are already in abduction, which actually makes the nappy area accessible. Use nappy cream as normal, and change frequently — the harness keeps the nappy area warm and skin can become irritated more quickly than usual. Check regularly under the straps for any redness or skin breakdown.
During the one-hour harness break, a shallow bath or careful sponge bath works well. Support the hips carefully during bathing — avoid allowing the legs to hang unsupported or adduct (come together). A baby bath insert or support can help. Dry thoroughly before the harness goes back on, paying particular attention to the skin under the straps and in the skin folds.
Standard babygrows and sleepsuits are often too narrow in the leg to fit over the harness. Wide-leg or open-crotch designs work well — many brands make "harness-friendly" styles. Vests worn under the harness help protect skin. Dressing in layers — vest under harness, then wider clothing over — tends to work better than trying to fit everything inside the harness. Steps charity (steps-charity.org.uk) has specific clothing guidance and a community of parents who share practical tips.
Safe sleep guidance applies exactly as normal — back to sleep, firm flat mattress, no loose bedding. The harness does not change safe sleep positioning. Some babies sleep better in the harness once established, as the frog position is comfortable and the harness provides a sense of containment.
Most rear-facing infant car seats accommodate a Pavlik harness well — the reclined, leg-up position of a rear-facing seat is compatible with the harness position. Check the fit carefully with your baby in the harness before travelling, and confirm with your orthopaedic team or the manufacturer if uncertain. The harness straps should not be compressed between the baby and the car seat.
Hip-healthy carrying — where the baby is held in an M-position, with the knees higher than the bottom and thighs supported — is beneficial for hip development generally and entirely compatible with the Pavlik harness. Many slings and soft structured carriers accommodate the harness position well. Upright front carries with the baby facing in are usually the most comfortable for both baby and parent. The International Hip Dysplasia Institute (hipdysplasia.org) has specific guidance on hip-healthy carrying positions.
Breastfeeding and bottle feeding are entirely possible with the harness on. The frog position may require some adjusting of hold positions — a rugby ball or cross-body hold may work better than a cradle hold for breastfeeding. Your midwife or health visitor can help if you are finding feeding positions uncomfortable.
For the minority of cases where the Pavlik harness does not achieve a stable hip — usually where the initial dislocation was complete or the harness was started later — further treatment is available and effective.
Closed reduction is performed under general anaesthetic. The orthopaedic surgeon gently manipulates the hip back into position without opening the joint. An arthrogram — where contrast dye is injected into the hip joint and X-rayed — confirms that the reduction is successful and the femoral head is centred. The hip is then held in position with a hip spica cast.
A hip spica cast is a plaster cast that encases the lower body — from the waist or chest down to one or both knees — holding the hips in the reduced position while the joint stabilises. It is typically worn for approximately 12 weeks, sometimes with cast changes every 6 weeks under anaesthetic. Life in a spica cast is significantly more demanding than the Pavlik harness — nappy care, bathing, car travel, and positioning all require specific adaptations. Your orthopaedic team will provide detailed practical guidance, and Steps charity has extensive resources for spica cast families.
If closed reduction is not successful, open reduction — surgical opening of the hip joint — may be required to remove any tissue obstructing the femoral head's return to the socket and to stabilise the joint. This is more commonly needed for older babies and children with late-diagnosed DDH or for complex cases. Recovery involves a spica cast following surgery.
DDH diagnosed after walking age — typically because subtle signs were missed in infancy — is significantly more complex to treat and carries a less certain prognosis. This is the strongest argument for the systematic newborn screening programme and early referral for ultrasound in high-risk babies. If you have concerns about your child's gait, leg length, or hip movement at any age, raise them with your GP.
A DDH diagnosis in the first days of life comes as a shock. The newborn examination was supposed to confirm that everything was well — and instead it has led to a referral, an ultrasound, and the news that your baby needs a harness. The gap between that expectation and reality takes time to absorb.
DDH is caused by genetic factors, hormonal influences on ligament laxity, and the mechanical realities of fetal positioning in the womb. Nothing a parent did during pregnancy — how they slept, how they moved, how they carried the baby after birth — causes DDH. This needs to be said clearly because parental guilt is common and entirely unwarranted.
The harness does not prevent bonding. Skin-to-skin contact is possible — the harness can be opened at the chest for skin-to-skin, and the one daily harness-free hour can be used for bath time bonding. Most parents describe the first days of the harness as the most difficult, and the first week or two as an adjustment — after which it simply becomes normal. The baby does not experience the harness as abnormal because they have no frame of reference; they adapt considerably faster than their parents.
Babies in a Pavlik harness develop normally. The frog position of the harness is consistent with healthy hip development and does not restrict most normal infant movement — kicking, arm movements, head turning, and early social development all proceed as normal. Tummy time can and should continue during the harness-free bath hour. Babies who crawl, pull to stand, or walk slightly later than average due to harness treatment almost invariably catch up completely within a few months.
Steps charity (steps-charity.org.uk · 01925 750271) is the UK charity for children and adults with lower limb conditions including DDH. They provide information, a helpline, peer support groups, a community forum, and practical resources including clothing guidance for harness and spica cast families. For parents navigating a recent DDH diagnosis, connecting with other families who have been through the same experience is often more immediately useful than clinical information alone.
The first week of the harness I cried every time I changed his nappy. By week three it was just normal — just part of getting him dressed, nothing more. He never seemed bothered by it for a day. It was entirely my grief about it, not his. He's two now and you'd never know.
The prognosis for DDH diagnosed and treated early is excellent. The majority of babies treated with a Pavlik harness — particularly those whose treatment begins in the first weeks of life — develop completely normal hips with no long-term functional difference from unaffected peers.
After treatment is complete, most children are followed up with X-rays until skeletal maturity — typically mid-adolescence — to confirm that the hip is developing normally. The acetabulum continues to remodel throughout childhood, and most treated hips show progressive normalisation over time. Long-term follow-up is not a sign that something is wrong; it is standard surveillance.
Well-treated early DDH carries a very low risk of early hip arthritis. Late-diagnosed or inadequately treated DDH carries a significantly higher risk. This is why early diagnosis and complete treatment adherence matters — it is not just about childhood function, but about the hip that person will have for the rest of their life.
Having had DDH does not preclude pregnancy or affect obstetric management for most people. Women who have had significant DDH surgery — particularly those with remaining hip deformity — may warrant discussion with their obstetrician about the impact of pregnancy and delivery on their hip joints. For most, this is not a significant factor.