Wunzi Infant System

TheraTogs Wunzi Infant System was inspired by the familiar ‘onesie’ for infants. Wunzi is designed for babies up to 26 lbs. and provides a customizable body hug that improves trunk alignment and stabilizes the core.

Postural control is an essential component of early intervention

Babies build trunk and neck control/strength before they gain functional skills. Trunk control problems that occur in infancy typically lead to long-term developmental deficits in limb use and movement.

The Wunzi system is designed to help very young clients by increasing sensory input while improving core stability. One of our most popular products, it supports therapy goals both during and between therapy sessions, providing essential carry-over.

The base system includes limb cuffs and strapping to create optimal posture, and the add-on Limb Kit operates like external muscles and ligaments to improve functioning body and proximal joint alignment for better motor development.

Goes on in seconds and over diapers

Caregivers love the over-the-diaper design which is quick and easy to put on. Closure tabs are embedded right into the garment – no loose tabs to keep track of.

Like all TheraTogs systems, the Wunzi is a comfortable, foam-lined, Velcro®-sensitive garment and strapping system that grips the skin. The patented composite fabric is elasticized with a stretch bias that favors good postural alignment – excellent for a growing baby.

Wunzi FAQs

Product Information Sheet (PDF)

Infant Postural Alignment Algorithm

Product Specifics

If you don’t see your indication in this list talk to your clinician or call us to see if the Wunzi might be right for you.

  • Hypotonia
  • Diplegic Cerebral Palsy
  • Hemiplegic Cerebral Palsy
  • Torticollis
  • Athetosis
  • Cerebellar Ataxia
  • Obstetrical Brachial Plexus Injury (OBPI)
  • Developmental Delay

Working together, the clinician and caregiver can achieve these and similar outcomes with the Wunzi Infant System:

  • Increase sensory awareness and information
  • Train functioning trunk muscles in shorter state to improve postural alignment and control
  • Limit excessive trunk motions
  • Improve functioning alignment of hips and/or shoulders
  • Gently stabilize one or both scapulae
  • Improve respiration by reducing flexible kyphosis

Hadders-Algra M, Brogren E, Katz-Salamon M, Forssberg H. Periventricular leukomalacia and preterm birth have different detrimental effects on postural adjustments. Brain 1999;122(Pt 4):727– 40.

van der Fits IB, Flikweert ER, Stremmelaar EF, Martijn A, Hadders- Algra M. Development of postural adjustments during reaching in preterm infants. Pediatr Res 1999;46:1–7

Gorga D, Stern FM, Ross G, Nagler W. Neuromotor development of preterm and full-term infants. Early Hum Dev 1988;18:137– 49

de Groot L, Hopkins B, Touwen B. Muscle power, sitting unsupported and trunk rotation in pre-term infants. Early Hum Dev 1995;43:37– 46

Smyth TR. Impaired motor skill (clumsiness) in otherwise normal children: a review. Child Care Health Dev 1992;18:283–300

Plantinga Y, Perdock J, de Groot L. Hand function in low-risk preterm infants: its relation to muscle power regulation. Dev Med Child Neurol 1997;39:6 –11

Dargassies SA. Neurological Development in the Full-Term and Prema- ture Neonate. Amsterdam: Excerpta Medica; 1977.

Casear PJM. Postural Behavior in Newborn Infants. London: [Published for] Spastics International Medical Publications [by] William Heinemann Medical Books. 1979.

Gesell A. Gesell and Amatruda’s Developmental Diagnosis; the Evaluation and Management of Normal and Abnormal Neuropsychologic Development in Infancy and Early Childhood. Hagerstown, Md: Medical Department, Harper & Row; 1975.

Allen MC, Capute AJ. Tone and reflex development before term. Pediatrics 1990;85:393–9

VlesJS,KingmaH,CabergH,DanielsH,CasaerP. Posture of low-risk preterm infants between 32 and 36 weeks postmenstrual age. Dev Med Child Neurol 1989;31:191–5

Cioni G, Ferrari F, Prechtl HF. Posture and spontaneous motility in full term infants. Early Hum Dev 1989;18:247– 62

Brazelton TB. Neonatal Behavioral Assessment Scale. London: Mac Keith Press: Distributed by Cambridge University Press; 1995.

Saville DJ. Multiple Comparison Procedures: The Practical Solution. Am Stat 1990;44(2):174 –180

Hadders-Algra M, van der Fits IB, Stremmelaar EF, Touwen BC. Development of postural adjustments during reaching in infants with CP. Dev Med Child Neurol 1999;41:766 –76

For Torso Length measurement (expressed in inches), measure down from C-7 (the big bone at the bottom of the neck) over the diaper and up to the child’s navel as shown below. Be careful to wrap the tape gently over the diaper. For Belly Girth, measure the infant’s belly circumference at the navel (also in inches).

Model #

Model Name



Torso Length

Belly Girth

wunzi image

Torso Length


Wunzi XXSmall

0 – 3 mo.

7 – 12 lbs.

16 in

16 in


Wunzi XSmall

3 – 6 mo.

12 – 17 lbs.

20 in

17 in


Wunzi Small

6 – 12 mo.

17 – 18 lbs.

22 in

18 in


Wunzi Medium

12 – 18 mo.

18 – 21 lbs.

24 in

20 in


Wunzi Large

18 – 24 mo.

21 – 26 lbs.

27 in

21 in


Limb Kit, Small

0 -12 mo.

Up to 18 lbs.



Limb Kit, Large

12 – 24 mo.

Up to 26 lbs.


Measure and Fit Guidelines

The Wunzi can change infants’ lives – we’ve seen it with our own eyes – so it’s official company policy: babies don’t wait.We make every effort to ship Wunzi orders within three working days of order. Click here for ordering guidelines

Some clinical objectives may be better addressed with the smallest sizes of a different TheraTogs system:

If you need… See also…
To address gait or lower extremity alignment issues Smaller sizes of the Full Body System or the Lower Extremity System.
Postural correction or trunk support for larger, potty-trained child Smaller sizes of the PTA System
More substantial trunk support and postural correction Smaller sizes of the Dragonfly TLSO System
TheraTogs systems are FDA Class I medical devices intended to be issued by, and applied under the supervision of, a licensed healthcare practitioner engaged in neuromotor training. TheraTogs systems are made of GoldTone – a proprietary composite fabric with foam backing made of an aqueous-based elastomeric urethane. TogRite strapping is elastomeric strapping with an inert, silicone-based grip surface. All materials and components of TheraTogs™ orthotic garment systems are latex-free in their manufacture and packaging.
TheraTogs™, Therapy You Wear™, TogRite™ and Wunzi™ are trademarks of TheraTogs, Inc. TheraTogs systems are protected by US Patents # 8,007,457 and 8,535,256 B2, and Canadian patent #2495769. Additional US and foreign patents pending.

Wunzi is a body hug that improves trunk alignment and core stability

Easy to use!