Happy Strap

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Happy Strap, is a harness to help children with the effects of hypotonia. It ensures that the legs stay in the correct position relative to the hips and prevents the legs from splaying. Happy Strap is registered in the EU as a medical device.

  •  Available in four sizes and different colours
  •  Washable for repeated use

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£ 85.95

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Happy Strap is offered in four sizes depending on the thigh circumference of the child and the approximate age outlined below is based on the average size of a normal child. To determine the correct size, please measure the mid-thigh circumference (halfway between the groin and knee); and a thumb's width (as the leg bands are not to be snug on the thigh of the child) and compare to the chart below.

Designed and developed in 2007 by Janet Wichmann, for her son Jens. Jens has low muscle tone (hypotonia). From a sitting position, with legs splayed at almost 180°, he would lie down between his legs and then move his legs around the outside of his body resulting in him being prostrate on the floor. He would then sit up using the reverse motion. Janet had been warned about how damaging this rotation of the hips could be and went about designing something to counter this problem.



The Happy Strap effectively and efficiently kept his legs from splaying and helped him tremendously achieve his developmental milestones.It also assisted greatly with his stability and balance. By age 3½ years, Jens was a very active little boy who walked steadily, climbed well and moved incredibly fast, yet he was happier and more confident wearing his Happy Strap than not. Janet’s wish is for every little hypotonic body to enjoy – from as young an age as possible – the same benefits, assistance and stability as Jens has had – and to make life a little easier for these children by increasing their mobility through stability.


Happy Strap limits excessive hip abduction and therefore limits reliance on solely saggital plane movement when transferring from one postion to another. This in turn encourages the development of musculature that enables movement in frontal and transverse planes.


Hypotonia is commonly found in children with Down Syndrome and children with Athetosis. Hypotonia is not a specific medical disorder, but a potential manisfestation of many different diseases and disorders that affect motor nerve control by the brain or or muscle strength. Recognizing hypotonia, even in early infancy, is usually relatively straightforward, but diagnosing the underlying cause can be difficult and often unsuccessful.

The long term effects of hypotonia on a child´s development and later life depend primarily on the severity of the muscle weakness and the nature of the cause. Some disorders have a specific treatment but the principal treatment for the most hypotonia of idiopathic or neurologic cause is physical therapy and /or occupational therapy to help the person compensate for the neuromuscular disability.