The parasternal short axis view is best for determining the morphology of the aortic valve leaflets, which is important in regards to defining the etiology of aortic valve stenosis in children, which is most commonly due to commissural underdevelopment.
Left sternal border
3rd of 4th intercostal space
Notch pointing towards the left shoulder (1-2 o'clock)
Bicommissural or unicommissural aortic valve (profiles which leaflets underdeveloped/fused)
Aortic regurgitation (site of origin)
Assess fusion of specific aortic valve cusps/commissures