2. 1: Study design:
We conducted a retrospective study through analysis of the offline measurements obtained from 2D transthoracic echocardiographic images of normal healthy neonates. We enrolled all neonates from the post -natal ward in Prince Sultan Military Medical city (PSMMC) in Riyadh who were referred to pediatric cardiology service for evaluation over the period from 1st January 2021 to 28thFebruary 2021.