Great question! Many parents are becoming more savvy to radiation exposure.
Did you know everyone is exposed to radiation daily?
The soil, rocks, water, and riding in airplanes give us small amounts of cosmic radiation without any problems. Luckily, most hospitals realize that kids have different needs than adults. Many children's hospitals are investing in lower dose radiology equipment for this reason.
One single chest x-ray is not concerning at all--even to newborns! It is not putting your child at any risk.
Imaging should only be used if there is a definite medical benefit.
The lowest amount of radiation possible should be used based on the size of the child.
Imaging should only include areas needing to be evaluated.
If possible, use non-radiating imaging such as ultrasound or MRI.
Additional Information from HealthyChildren.org: