in a 4 year old child can be due to a number of reasons. GERD
can be one of them. However it is difficult to say what is the cause by the X-ray report. Though the pediatrician
must be doing a work up for the cause but history and clinical examination will go a long way in deciding the course of action. I suggest that you discuss with the pediatrician and follow the advice.
Wishing your daughter an early relief.