Infant-directed singing is a medium for parents and infants to communicate in a mutual relationship. Parental infantdirected singing is a multisensory, biopsychosocial communication that applies to ill and vulnerable hospitalised infants. The primary musical features of infant-directed singing are ideal for emotional coordination and sharing between parent and infant without the risk of over-stimulation. In this article, we suggest that parental infant-directed singing is regarded as a nonpharmacological emotion regulation intervention, which may modify the painful experience for both the infant and the parent before, during and after painful procedures in the neonatal intensive care context. Parents have the biopsychosocial resources to alleviate their infant's pain through infant-directed singing, if they are empowered to do so and coached in this process. A music therapist specialised in neonatal music therapy methods can mentor parents in how to use entrained and attuned live lullaby singing in connection to painful procedures. Pain and the vast amount of painful procedures early in infancy, combined with early parent-infant separation and lack of parental participation in the care of the infant during neonatal intensive care, place arduous strain on the new family's attachment process and on the infant's and parents' mental health, both from a short and long-term perspective. Therefore, we argue with biopsychosocial rationales, that live parental infant-directed singing should be promoted in neonatal pain care worldwide. Consequently, parents should be welcomed round the clock and invited as prescribed pain management for their infant.