Chest xray on toddler . Any nurses?

So, my toddler who is two has had 4 X-rays on his chest due to his dr thinking that my child has pneumonia or something , but every scan has came out clear and normal.

I’m started to think that his raspy voice is his normal voice and it sounds cute , but his dr thinks other wise .

My question- is it bad to get frequent X-ray like 4 X-rays by age 2 already? Has anyone baby gone through this many and ended up okay??