I'd say he'd be more understanding if he did have children. However, to be a pediatrician a person first needs to study medicine for five years. Following this they decide which area to practice an experteese... to want to help children is commendable, and takes more study and exam passing.
Why would they want to be a professional child doctor??
It may be that they feel more could be done in this area, or they may have watched a sick sibling and wished they could help.
I believe the only thing I would be careful of is that they were not a pedophile...While this sounds harsh it is a reality in our world today.
ON THE BRIGHT POSITIVE SIDE: From all the pediatricians I have met, they have always been wonderful caring dedicated people.
All the best!!