Inclusion Criteria:  Healthy singleton term infants with no clinical signs and symptoms (e.g., cyanosis, respiratory distress, heart murmur, etc.).  Exclusion Criteria:  1. Low birth weight (< 2500 g). 2. Need for oxygen. 3.1 or 5 minute Apgar score < 7. 4. Referred to the neonatal intensive care unit or neonatology department for various reasons. 5. Neonates discharged within 24 hours of birth. 6. Neonates diagnosed with congenital diseases in utero. 7. Refusal of consent.