We present the case of a 9 months old boy with an X-linked form of anhidrotic (hypohidrotic) ectodermal dysplasia. Several chest X-rays had been performed to rule out pneumonia because of recurrent episodes of high fever. The child's lack of tooth buds (hypodontia), which could be encountered on the margins of the chest X-rays, are suggestive for ectodermal dysplasia.