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The science that supports The Zaky ZAK®

The Zaky ZAK

The Zaky ZAK®  is the kangaroo care device specifically engineered to hold infants (skin to skin contact or clothed) that weigh from 1 to 15 lbs in any hospital unit and at home. 

It was engineered by Yamile Jackson, a Ph.D. in ergonomics and safety engineering and [kangaroo] mother of Zachary (who spent 5 months in two different NICUs surviving, fighting, and thriving against all odds).  The Zaky ZAK® is a safety device engineered with quality, safety, comfort, easy access, and effective transfers in mind. Do not accept imitations.

It is unisex, used in Antepartum, Labor and Delivery, c-sections, NICU, PICU, any unit where babies are present - and homes.

Please email info@thezaky.com if you are planning, working on, or know of any other(s) studies.
These are the independent studies and publications of the groundbreaking results of the studies about or that have used The Zaky ZAK®.   For studies about kangaroo care or skin to skin contact you may visit www.kangaroo.care


The Zaky ZAK publication heart disease

Publication: Neonatal Skin-to-Skin Contact [With The Zaky ZAK]: Implications for Learning and Autonomic Nervous System Function in Infants With Congenital Heart Disease

The publication that reports the results of Skin to Skin Contact/Kangaroo Care with infants with congenital heart disease is published!

Every mom/baby dyad used The Zaky ZAK (aka Kangaroo Zak) for Skin to Skin contact sessions, and is acknowledged/described in the paper on page 3!


Parent-Training with Kangaroo Care Impacts Infant Neurophysiological Development & Mother-Infant Neuroendocrine ActivityParent-Training with Kangaroo Care Impacts Infant Neurophysiological Development & Mother-Infant Neuroendocrine Activity

Jillian S. Hardin, Nancy Aaron Jones,  Krystal D. Mize, Melannie Platt

Infant Behavior and Development, Volume 58, February 2020, 101416; https://doi.org/10.1016/j.infbeh.2019.101416

Infants were full-term (> 37 weeks GA). Mothers assigned to the Kangaroo Care Group were given a KC wrap (Nurtured by Design's The Zaky ZAK/Kangaroo Zak)

A randomized control trial was conducted to investigate the effects of skin-to-skin, chest-to-chest contact (kangaroo care, KC) in mother-infant dyads on patterns of infant brain activity and associated mother-infant neurohormone releases. 33 mother-infant dyads participated during pregnancy (29–38 weeks gestation), at neonatal and 3-month periods.

Overall, analyses indicated that:
1) infants in the KC group showed left frontal brain activation patterns (asymmetry and coherence) associated with KC training;
2) KC produced moderate to large increases in oxytocin levels; and
3) KC yielded moderate decreases in cortisol reactivity.

Findings suggest KC may garner favorable neuro-maturational and neurobiological outcomes for dyads.



Publication: Kangaroo Care Implementation [with The Zaky ZAK] - Quality Improvement Project
Publication: Kangaroo Care Implementation [with The Zaky ZAK] - Quality Improvement Project

The Sobreviver Project (Survive) By Mary Coughlin, RN, MS, NNP, Caring Essentials Collaborative, LLC. Boston.

Newborn and Infant Nursing Reviews Volume 15, Issue 4, December 2015, Pages 169-173

Every mother was provided a The Zaky ZAK (aka Kangaroo Zak) in this Quality Improvement Project and Mary Coughlin, explains why. 


by Elizabeth Jeanson PT DPT; Sheri Fischer, MSN RN CBC; Andrea Bunn DNP RN; David Munson, MD; Jessica Schnyders BSN RN; Nate Harris BSN RN

Sanford Improvement Academy selected The Zaky ZAK as part of their Kangaroo Care implementation. The goal was to improve confidence, duration, and frequency by 20%.

Here are the results:

• Parental confidence increased by 62% on the PPCI
• Duration of STS holding increased by 62%
• Frequency of STS holding increased by 26%


 Clinician Opinions and Approaches to Manage Risk Related to Safe Sleep During Skin-to-Skin Care

Ashley Weber, Mason Elder, Kristin C. Voos, Joshua W. Lambert, Heather C. Kaplan, and Yamile C. Jackson


"The article 'Clinician opinions and approaches to manage risk related to safe sleep during skin-to-skin care' (JOGNN, 49, 464-474) was one of seven articles nominated for the 2021 Best of JOGNN Writing Award. This is JOGNN’s premier award. The award will be presented during AWHONN’s 2021 Convention scheduled in October.   Although JOGNN’s Editors and Editorial Advisory Board did not choose your article to receive this year’s award, I extend my congratulations to you and your co-authors for your significant contribution to JOGNN’s excellence in 2020.  Your article was one of the best.  Criteria for award include originality of the work; clarity and scholarliness of the writing; potential to significantly affect the care of women, infants and/or childbearing families; and the interdisciplinary importance of the work.   Thank you for your contribution to nursing’s scholarly literature and particularly for your significant contribution to JOGNN in 2020.  Best wishes for continued professional success and I encourage you to consider JOGNN as a publication outlet in the future.  
Nancy K. Lowe, PhD, CNM, FACNM, FAAN 
Editor in Chief, Journal of Obstetric, Gynecologic, & Neonatal Nursing (JOGNN)
Professor Emerita
College of Nursing University of Colorado"


 A Survey of Neonatal Clinicians’ Use, Needs, and Preferences for Kangaroo Care Devices

Ashley Weber, PhD, RN; Yamile Jackson, PhD, PE, PMP



Application of a Risk Management Framework to Parent Sleep During Skin-to-Skin Care in the NICU

Ashley M. Weber, Yamile C. Jackson, Mason R. Elder, Sarah L. Remer, Nehal A. Parikh, Jennifer J. Hofherr, Kristin C. Voos, and Heather C. Kaplan







Unplanned extubations during kangaroo care is a preventable injury during kangaroo care with The Zaky ZAK (aka Kangaroo Zak) at Children's Hospital of Atlanta (CHOA)


Click here to see the science behind The Zaky HUG