“…However, researchers are increasingly interested in the influence of cortisol levels in breast milk on the offspring phenotype [7,8]. Dettmer et al [33] believe that already during pregnancy, the mother's body sends physiological signals to the developing foetus, which affects the baby's behavioural profile adapted to the environment in which it will grow up. When feeding natural milk, mothers may continue to transmit information to their baby using the biological components of the milk, including cortisol [34].…”