Exposure to MNP through the vulnerable stages of infancy and childhood. Citations: In utero: Placenta [54, 55]; Newborn: Meconium and infant stools [56, 57]; Breast milk: [57, 58]; Bottle feeding: [50, 57]; Oral exploration[40, 59, 60]; Childhood activities: [40,41,42,43, 61,62,63,64,65]