In 2023, the World Food Security and Nutrition Report estimated between 691 million and 783 million people who suffered from hunger in 2022 [1] . According to the WHO, child undernutrition is a public health issue. In 2022, it was estimated that globally 149 million children under 5 years of age were stunted, 45 million were wasted [2] . Infants under 6 months of age are the most affected [3] . Many infants under 6 months of age in Low- and middle-income countries are at risk of stunting and development: about 10.3 million worldwide are underweight; 9.2 million are wasted, 11.8 million are stunted, and 8.9 million are low birth weight [4] . Undernutrition plays a role in nearly half of all deaths among children under 5 years of age. These deaths occur mainly in low- and middle-income countries [2] [5] .

In Burkina Faso, the nutritional situation is characterized by the persistence of malnutrition in all its forms. The prevalence of wasting and nutritional oedema was 9.7%, chronic undernutrition was 21.6% and underweight was 17.5% in children under 5 years of age [6] . The national protocol for the integrated management of acute malnutrition (PCIMA) treats infants under 6 months of age in hospitalization [7] . A key aspect of the World Health Organization (WHO) guidelines for the prevention and management of wasting and nutritional oedema is the emphasis that mothers and infants are seen as an interdependent couple, whose health and well-being are intimately linked, and that any assessment of one must also involve an assessment of the other [8] . Infants younger than 6 months of age with the highest risk of death are better targeted by the use of mid-upper arm circumference (MUAC) [9] - [11] . The United Nations Children’s Fund (UNICEF) has introduced a prototype of a double-sided mother-infant bracelet that can take measurements of both mothers and their infants [11] - [13] . The aim of this pilot study was to assess the nutritional status of mother-infants with the prototype of a double-sided MUAC measurement bracelet in preparation for the integration of this strategy during the revision of the protocol for the prevention and management of malnutrition in Burkina Faso.

During six months, we collected 417 mothers and infants who came to the center for consultation or hospitalization.

The MUAC with the prototype mother-infant double-sided measurement bracelet was less than 110 mm in 15.59%, the weight-for-height ratio < −3 Z-score for 11.93% in infants. For mothers, the MUAC was less than 230 mm in 6.47% and the BMI < 18.5 in 7.43%. In Kenya, a MUAC < 110 mm occurred in 19% of infants [11] . However, to our knowledge, the relevant published data allowing a meaningful comparison with the results of this study are almost non-existent since the MUAC threshold was not homogeneous before the WHO recommendations in 2023. These MUAC thresholds varied between 105 mm and 125 mm depending on the study [10] [11] [16] [17] . By comparing the MUAC as a screening and diagnostic tool for children at risk of growth or developmental disorders to current standards, it allows more infants to be included in the program with the implications that this will have on care [13] [17] .

The updated WHO guidelines has provided, in addition to the specific anthropometric criteria in the list of criteria used to identify infants at risk of poor growth and development, other criteria such as infants with low growth on the basis of sequential measurements, infants with known risk factors for poor growth and development or infants at risk due to poor birth outcomes (preterm birth or low birth weight) [8] . This will therefore make it possible to widen the threshold of infants concerned in the center. This will require the organization of screening, inpatient or outpatient care in the center that is not taken into account in the old recommendation [7] [8] [19] .

An infant’s well-being is intimately linked to that of his mother, as is his care. Vulnerable infants under six months of age should receive comprehensive, person-centered care for them and their mothers [13] [20] - [22] . The screening rate with the prototype of a double-sided mother-infant bracelet is close to that of BMI. Higher rates have been found in other studies [23] These mothers, who are themselves vulnerable, must be cared for with the infant as an interdependent unit. This request for care can concern their physical, mental or social health. In addition, a comprehensive assessment of breastfeeding and subsequent support for the health and well-being of the infant and his/her mother must be done. In our case, early breastfeeding and exclusive breastfeeding were practiced in 73; 14% and 78.66% respectively, which was close to the national rate of the SMART nutrition survey at 97.6% and 77.50% but higher than the rate of Cissouma et al. in Mali which had a rate of 38.10% and 17.46% respectively [6] [24] . In fact, this involves establishing close linkages with antenatal and postnatal care services, sexual and reproductive health services (such as family planning), and other preventive and curative services where women and children are in contact with health workers (e.g., for immunization, growth monitoring, psychological services) [3] [8] . Our center, due to its tertiary level in the health pyramid of our country, has various services that could ensure the integrated care of mothers and children in an integration that allows us to provide a complete package of health services and support to women and children. There is a need to provide holistic care accounting for the expressed and unexpressed needs of the mother-child pair at the points of contact which involves multiple disciplines and actors in health, nutrition and social services [20] .

Studies show that the mid-upper arm circumference is recognized as an instrument that can best target the risk of death in the population [10] [16] [18] [19] . It appears to be a tool that can be easily adopted for infants and their mothers/guardians. The advantage of inclusion based on the MUAC is simple, convenient and easy to use for both health professionals and mothers [18] [25] [26] . This confirms that the prototype can improve screening for mothers-infant and their care in our healthcare facilities, hence the importance of its acceptability by mothers and healthcare workers.

The study should be interpreted considering some limitations. The results are not representative of the national population. However, it has the merit of having been the pilot study using this prototype of a mother-infant double-sided mid-upper arm circumference bracelet.

The rate of children at risk of growth disorders or poor development was high at the CHUYO. The prototype of a double-sided mother-infant bracelet for measuring MUAC could identify vulnerable children and their mothers. CHUYO could provide integrated care for mothers and children in an integrated manner that would provide a comprehensive package of health and support services to women and children. It is up to the center to anticipate the involvement in terms of organization to provide this integrated care for the implementation of the Protocol for the Prevention and Management of Malnutrition currently being revised to take into account updates to WHO guidelines. The introduction of the double-sided mother-infant measurement bracelet at the primary care and community levels could complement this study.

Nutrition Directorate of the Ministry of Health for its technical support, the UNICEF country office which procured the prototype of the mother-infant double-sided MUAC bracelet, provided training for the agents, the General Directorate of CHUYO, the participants.

The authors thank Dr Compaoré Salomon for his assistance with the reviewing of this article.