A Smart Jumpsuit Tracks Infants’ Motor Development

Summary: A newly designed baby jumpsuit that monitors motor development carries the possibility for assessing overall neurodevelopment in infants.

Source: University of Helsinki

New wearable technology creates new possibilities for assessing the neurological development of young children. Early motor assessment is essential for supporting the early detection of neurodevelopmental problems and their therapeutic interventions.

A Finnish research group at the BABA Center, Helsinki Children’s Hospital, has developed a novel wearable for infants for the reliable assessment of motor abilities during early development.

The smart jumpsuit MAIJU (Motor Assessment of Infants with a Jumpsuit) is a wearable medical device equipped with multiple movement sensors, which assist in assessing and predicting children’s neurological development.

In their recent study, the scientists measured infants at 5 to 19 months of age using the MAIJU jumpsuit during spontaneous playtime, mostly in the children’s own home environment.

In the beginning of the study, the postures and movements of the infants were identified visually from a video recording using a motility description scheme custom developed for this study.

This information was then used to train an algorithm based on machine learning to recognize the same postures and movements for every second of each child’s playtime at an accuracy that equals visual assessment by a trained expert.

“The development of the MAIJU wearable required a technical breakthrough in the development of machine learning algorithms for this purpose. This was achieved by combining a new kind of motility description with state-of-the-art deep learning solutions,” states the leader of technical development, Dr. Manu Airaksinen.

New methods for studying neurological development

The MAIJU jumpsuit and the associated analytical solutions allow both the assessment and tracking of child’s motor maturation at an unprecedented accuracy. This advance can be exploited in many ways, for instance in early clinical diagnostics and other developmental assessments, and it also makes it possible to measure efficacy in various kinds of medical treatments and therapies.

“Our research shows that it is very possible to assess the motor development of an infant outside of a hospital or special laboratory setting. A particular advantage of the MAIJU methodology is the fact that it allows us to carry out developmental assessments in the natural environment of the child, such as a home or daycare,” explains Sampsa Vanhatalo, professor in physiology and the leader of the BABA Center.

“Methods of this kind are urgently needed to support the research and novel therapeutic innovations of early neurological development,” confirms Leena Haataja, professor in child neurology.

The earlier neurodevelopmental delays and related challenges are identified, the better we can support the child’s upcoming development and lifelong neurocognitive performance.

Children move to learn

It is now commonly accepted that the motor development of a young child is not independent of all other neurocognitive development. The strong innate drive of the child to move has emerged from a clear need: the child must move a lot to gain experience and learn from the surrounding environment.

This shows a baby in the jumpsuit
Overview of the MAIJU wearable, infant cohort, and recording data. (a) A 10-month-old subject crawling at home with the MAIJU jumpsuit, equipped with movement sensors in the proximal pockets of each limb. The photograph has been published with informed parental consent. (b) Summary of the infant cohort (N = 59 infants, N = 64 recordings) recorded in the present study. Bars depict a monthly breakdown of the numbers of infants with MAIJU recordings with vs without synchronized annotated video recordings, as well as the total length of data available for each age. (c) An example recording in the annotation software showing 20 s of the raw 24-channel data obtained from the four MAIJU sensors, as well as the respective human annotations for postures and movements shown in the bars above the signals, colored according to the motor ability categories. Note the frequent transitions in posture and movement categories. Credit: The researchers

“It is therefore important to encourage children to move as naturally and as much as possible in everyday life situations,” says Haataja.

A child with motor or other neurological challenges will need special support or therapies, which work best if they are part of the child’s everyday life and environment. The MAIJU smart jumpsuit makes it possible to find better therapeutic strategies in such situations and to assess the efficacy of such therapies.

New applications for wearables

Developing a smart wearable for medical use is a challenge many times harder than bringing a consumer product to the market. Vanhatalo believes that their successful work in wearable development has extensive global impact and a bright future.

“Our methods can be automatized and scaled up for very wide use. It is also possible that our technology could be adapted for developing wearable solutions to help other patient groups, such as older children or even elderly people.”

About this neurotech research news

Author: Press Office
Source: University of Helsinki
Contact: Press Office – University of Helsinki
Image: The image is credited to the researchers

Original Research: Open access.
Intelligent wearable allows out-of-the-lab tracking of developing motor abilities in infants” by Manu Airaksinen et al. Communications Medicine


Intelligent wearable allows out-of-the-lab tracking of developing motor abilities in infants


Early neurodevelopmental care needs better, effective and objective solutions for assessing infants’ motor abilities. Novel wearable technology opens possibilities for characterizing spontaneous movement behavior. This work seeks to construct and validate a generalizable, scalable, and effective method to measure infants’ spontaneous motor abilities across all motor milestones from lying supine to fluent walking.


A multi-sensor infant wearable was constructed, and 59 infants (age 5–19 months) were recorded during their spontaneous play. A novel gross motor description scheme was used for human visual classification of postures and movements at a second-level time resolution. A deep learning -based classifier was then trained to mimic human annotations, and aggregated recording-level outputs were used to provide posture- and movement-specific developmental trajectories, which enabled more holistic assessments of motor maturity.


Recordings were technically successful in all infants, and the algorithmic analysis showed human-equivalent-level accuracy in quantifying the observed postures and movements. The aggregated recordings were used to train an algorithm for predicting a novel neurodevelopmental measure, Baba Infant Motor Score (BIMS). This index estimates maturity of infants’ motor abilities, and it correlates very strongly (Pearson’s r = 0.89, p < 1e-20) to the chronological age of the infant.


The results show that out-of-hospital assessment of infants’ motor ability is possible using a multi-sensor wearable. The algorithmic analysis provides metrics of motility that are transparent, objective, intuitively interpretable, and they link strongly to infants’ age. Such a solution could be automated and scaled to a global extent, holding promise for functional benchmarking in individualized patient care or early intervention trials.

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