An increasing body of evidence supports maintaining the nuclear family unit at birth by promoting early newborn stabilization, prolonged uninterrupted immediate kangaroo mother care (iKMC) as soon as possible after birth, and initiating breastfeeding on the mother's bare chest, which is known as iKMC [1-3]. iKMC for preterm newborns has been associated with reduced mortality, nosocomial infections, and hypothermia in those weighing less than 1500 g [4]. It also improves breastfeeding rates [5,6], reduces parental stress and health care costs [7], and enhances long-term health outcomes [8]. Hence, the World Health Organization (WHO) recommends iKMC for neonates born after 28 weeks of gestation [9].

There is evidence regarding the feasibility and safety of iKMC in very premature newborns [10]. Nevertheless, there is a lack of clinical protocols or experiences explaining how to implement iKMC in other groups of ill newborns, particularly, late premature newborns, those requiring noninvasive respiratory support, or those with prenatal diagnoses. In many cases, there is very little evidence for these groups. This study aims to evaluate the feasibility and safety of iKMC at birth for sick newborns, thereby bringing the benefits of iKMC to a greater number of sick newborns and their families.

Between January and August 2024, 89 eligible newborns were admitted to the unit. Of these, 29 (33%) were excluded: 52% (15/29) were excluded due to respiratory distress with FiO₂>40%, 35% (10/29) due to maternal factors, and 14% (4/29) for reasons such as advanced resuscitation or care overload. The final sample comprised 60 newborns.

The characteristics of the included newborns are shown in Table 1. Significant differences were observed among groups 1, 2, and 3 in the gestational weeks (median 35+0 [IQR 34+2 to 36+0] weeks vs 40+2 [IQR 39+2 to 40+6] weeks vs 40+0 [IQR 38+5 to 40+4] weeks, respectively; P<.01) and birth weight (2350 [IQR 2080-2940] g vs 3290 [IQR 3130-3660] g vs 3230 [IQR 2970-3550] g, respectively; P<.01). Among the different congenital anomalies, 60% (14/24) were congenital heart diseases such as Tetralogy of Fallot or aortic coarctation, 20% (4/24) were neurological problems, and 10% (3/24) were other anomalies.

The characteristics of iKMC are presented in Table 2. The median duration was 120 minutes for all newborns, with no differences among the groups. All newborns received iKMC with their mothers. Notably, newborns in the respiratory distress group (group 2) more frequently required continuous positive airway pressure (CPAP) than groups 1 and 3 during iKMC (17/19, 90% vs 6/17, 35% vs 1/24, 4%, respectively; P<.01) and were more frequently transported in iKMC (16/19, 84% vs 8/17, 47% vs 10/24, 42%, respectively; P=.01).

Table 3 summarizes the characteristics of iKMC among protocol participants. Among those with interrupted kangaroo care, the median duration was 20 (IQR 20-30) minutes. Early separation occurred more often in newborns with prenatal diagnoses of congenital anomalies (9/24, 69% vs 2/17,15% vs 2/19,15%, respectively; P=.02), although the median iKMC duration did not differ significantly between the groups.

Temperature instability and hypoglycemia were not reported as the causes of separation. Newborns who experienced iKMC interruption were less likely to be transported in iKMC (3/13, 23% vs 31/47, 66%, respectively; P<.01). No significant differences in interruption rates were observed across work shifts (morning: 3/13, 23%; afternoon: 3/13, 23%; night: 7/13, 54%; P=.47). Interestingly, newborns requiring positive pressure ventilation at birth (n=9) were less likely to have iKMC interrupted (2/9, 22% vs 7/9, 78%, respectively; P=.02). Some details related with the characteristics of breastfeeding during iKMC and at discharge were also studied, which are shown in Table 4.

This study represents the first experience published in Europe demonstrating the feasibility and security of iKMC for sick newborns and late premature newborns. Nearly 80% (47/60) of the newborns remained in uninterrupted iKMC for 120 minutes, with 100% of that time spent skin-to-skin with their mothers, even among those requiring positive pressure ventilation or respiratory support. No complications occurred during the process or during skin-to-skin transport.

No studies have been found with which to compare the outcomes of iKMC in patients with prenatally detected congenital anomalies. Walsh et al [11] evaluated singletons born vaginally at 35-36 6/7 weeks gestation who were randomized to be initiated with iKMC with a reported time of immediate kangaroo care of 60 minutes. Our median uninterrupted iKMC duration of 120 minutes is notably longer, likely reflecting heightened staff awareness and targeted training. iKMC was interrupted in 22% (13/60) of the cases, predominantly due to worsening respiratory status (4/13, 31%). No interruptions were related to maternal issues, hypoglycemia, or temperature instability, consistent with prior literature [12,13]. This underscores the role of health care providers, sometimes unintentionally, as the main cause of mother-newborn separation.

Technical or logistical issues accounted for only 2 interruptions. No significant differences in iKMC duration or interruption rates were observed across different shifts or patient subgroups. Numerous studies support the safety and benefits of KMC for newborns requiring respiratory support from birth [13,14]. However, only one prior study comprising premature newborns, including late premature ones, demonstrated safe respiratory stabilization by using noninvasive ventilation during skin-to-skin care, achieving 40.6% stabilization in kangaroo care [13]. In our study, this rate increased to 79% (47/60), with 38% (9/24) of the patients discontinuing CPAP during KMC, thereby reducing admissions. Differences in GAs between studies should be noted.

Notably, newborns requiring respiratory support were more frequently transported skin-to-skin, confirming the feasibility and safety of this method. This study extends existing evidence to preterm and sick newborns. Regarding breastfeeding, iKMC is known to promote early latch and initiation in healthy term newborns [13,15]. Our findings extend this to preterm and sick newborns, with 30% (18/60) achieving early colostrum latch and a greater breastfeeding rate at discharge (57/60, 95%), including exclusive breastfeeding in half of the cohort.

This study is the first to detail the way to apply implementation of iKMC in preterm and sick newborns, achieving greater recruitment and applicability. A limitation is that our study was conducted in a unit with extensive staff training and strong commitment to iKMC, which may limit generalizability without similar institutional support. Indeed, our unit has previously published its experience regarding the implementation of iKMC in preterm newborns born between 28 and 34 weeks of gestation [10].

In conclusion, iKMC with uninterrupted skin-to-skin contact and transport during the first 120 minutes of life in late preterm and sick newborns is safe and feasible. Newborns that required noninvasive ventilation with FiO₂ <40% could be initiated with iKMC. Early mother-newborn contact also improves breastfeeding initiation. This study represents a further step toward zero separation—a goal strongly desired by parents of hospitalized newborns and actively advocated by the Global Foundation for the Care of the Newborn Infant. To date, most scientific literature has focused primarily on very premature newborns. However, extending the practice of iKMC to newborns with higher GAs has the potential to benefit a much larger number of families by preventing unnecessary separation.