Oxytocin is one of the two dominant lactation hormones. It is a nanopeptide with three amino acids bound via disulfide bridges to a cyclic part originating from a much long peptide string (Uvnäs Moberg et al., 2019). Neurons of the supraoptic and paraventricular nucleus of the hypothalamus are responsible for its release from the posterior pituitary. These neurons also reach into other brain regions where the release of oxytocin affects behaviour, psychology, and neuroendocrine functions (Uvnäs Moberg et al., 2019). Consequently oxytocin has been labelled as "the hormone of growth and relaxation, or calm and connection" (Uvnäs Moberg et al., 2019).