Inclusion Criteria:  The infant is born between 35 and 42 weeks. Require a heel prick Infants may be treated with antibiotics. Infants may be supported with non-invasive respiratory support. Infants may require blood sugar monitoring. Infants may be monitored for jaundice or infection. Written consent has been obtained from the person(s) with parental responsibility.  Exclusion Criteria:  Have a history of neurological problems. Receiving pharmacological analgesics. Known genetic condition. Breastfed babies Admitted to high dependency or intensive care Invasive respiratory support Receiving parenteral nutrition Has received any treatment for seizures Clinical instability in the judgment of nurses/midwives and paediatricians looking after the baby and mother.