See Doctor Now!: There are many possibilities for underlying causes of "failure to thrive". In this case it is not just failure to thrive but weight loss with recurrent illness. Many questions need to be answered but I would initially want to rule out cystic fibrosis, lung or esophagus or stomach anatomic abnormality, intestinal malabsorption disorder, inborn error of metabolism and immune deficiency disorders.
Answered 2/11/2016
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