Bicuspid valve with the gradients you mention is not something to worry about at this time. BAV is likely to progress though (almost one third cases or more), and may require surgery
in the future. BAV is one of the commonest congenital abnormality and mostly is clinically silent till age 30s or so. Many such patients present with symptoms in their 40s and 50s. I think your kid should be able to continue with normal childhood. He should be followed up with pediatric cardiologist
at regular intervals though.
Take care and don't take too much stress
for this. Its a fixable issue.