“…Frequently, the impact of maternal care on the infant and the degree of parental co-regulation is subtle, with its impact becoming visible with removal or dramatic changes in parental care. For example, young children can maintain homeostasis of vital functions, such as heart rate and respiration, but the regulatory role of parental care was shown through experiments comparing infants alone v. engaged in parental contact via somatosensory (temperature, touch), olfactory (caregiver odor), visual (face), and auditory (voice) stimulation ( Kommers et al, 2019 ; Suga et al, 2019 ; Buhler-Wassmann and Hibel, 2021 ; Ionio et al, 2021 ). This regulation is also seen in the infant’s co-sleep with the parent, producing improved sleep compared to when the infants sleep alone ( Mosko et al, 1997 ; Richard and Mosko, 2004 ; Waynforth, 2020 ; Yoshida and Funato, 2021 ).…”