A “hip flip” most commonly refers to a swaddling technique for newborns where the bottom of the blanket is folded or flipped to leave the baby’s legs free to bend and move naturally. The goal is to keep the arms snug while avoiding the tight leg wrapping that can harm a baby’s developing hip joints. The term also sometimes describes a hands-on pelvic mobilization used in physical therapy to realign the hip bones, or the audible “flip” or snap people feel from a condition called snapping hip syndrome. Here’s what each one involves.
The Hip Flip Swaddle Technique
New parents encounter the hip flip when learning to swaddle safely. Traditional swaddling wraps the entire baby tightly, including the legs, which can force the hips into a straight, pressed-together position. The hip flip modifies this by tucking or twisting the bottom portion of the swaddle cloth behind the baby so the legs stay bent up and out at the hips. This position allows the hip joints to develop normally while still giving the baby that cozy, wrapped feeling around the upper body.
The International Hip Dysplasia Institute recommends this approach because swaddling with the hips and knees held straight increases the risk of hip dysplasia and hip dislocation. Their guidelines are straightforward: babies’ hips should rest in slight flexion (bent) and abduction (angled outward), and the knees should stay slightly bent too. The “flip” in hip flip refers to that key step of folding or twisting the bottom of the blanket so it doesn’t restrict the legs.
How to Do It
If you’re using a square blanket, fold back one corner to create a straight top edge. Place your baby on the cloth with shoulders at that top edge. Bring the left arm down, wrap the cloth over the arm and chest, and tuck it under the baby’s right side. Repeat on the other side with the right arm. The critical part: twist or fold the bottom end of the cloth and tuck it behind the baby, making sure both legs can bend up and out freely. Leave plenty of room for the hips to move.
An even simpler alternative is to swaddle only the arms and chest, leaving the lower body completely unwrapped. Many modern swaddle products are designed with this in mind, featuring a snug top and an open or loose pouch at the bottom. Either approach protects the hips while still giving your baby the comfort of being swaddled.
The Pelvic Mobilization Technique
In physical therapy and manual medicine, a “hip flip” can refer to a mobilization that repositions the large wing-shaped bones of the pelvis (the innominates) relative to the triangular bone at the base of the spine (the sacrum). When these bones rotate out of their normal alignment, typically tilting forward on the sacrum, it can cause pain in the lower back, buttocks, and the sacroiliac joint area where the pelvis meets the spine.
This misalignment often happens when bending, lifting, or during pregnancy, as the body’s center of gravity shifts forward. The ligaments that normally hold the joint stable loosen, allowing the pelvic bones to rotate and temporarily lock in an abnormal position. Pelvic girdle pain from this type of dysfunction shows up as discomfort between the back of the hip crest and the buttock fold, particularly around the sacroiliac joints.
The correction involves a practitioner manually rotating the pelvic bones back into their balanced position, moving them downward and inward on the sacrum. When done correctly, the result can be immediate pain relief. In a case series published in The Journal of Manual & Manipulative Therapy, 62.5% of patients with chronic low back pain who received hip mobilizations combined with exercise reported feeling “moderately better” or higher after just three sessions. Those same patients experienced roughly a 24% reduction in their disability scores. While not every patient responds this dramatically, the results suggest that restoring pelvic alignment can be a meaningful first step for certain types of lower back and hip pain.
Snapping Hip Syndrome
Some people search for “hip flip” because they feel something literally flipping or snapping in their hip during movement. This sensation has a clinical name: snapping hip syndrome, also called dancer’s hip. It produces an audible or palpable snap during hip movement that can feel like something is flipping over the joint.
There are two main types. External snapping hip creates a sensation that the hip is partially dislocating (though it isn’t actually). You can often see or feel the snap on the outside of the hip. Internal snapping hip feels more like a catch or lock deep inside the joint, usually accompanied by an audible pop. Both types involve a tendon or muscle sliding over a bony prominence during movement.
Snapping hip is common in dancers, athletes, and people who do repetitive hip flexion. It’s often painless at first, just strange and noticeable. Over time, if the snapping irritates the surrounding tissues, it can become painful and limit activity. Stretching, strengthening the muscles around the hip, and modifying activities that trigger the snap are the typical starting points for managing it.