The purpose of this research study is to evaluate the effects (good and bad) of supplementation with Glutamine to that of a placebo (L-alanine), on your child and their Short Bowel Syndrome. Researchers are doing this study to see if the addition of Glutamine to oral/tube feeding (nutrition therapy) will work better by preventing bloodstream infections, improving growth, and/or changing the make-up of bacteria in your child's intestine. Glutamine is approved by the FDA for use in adults with Short Bowel Syndrome. In this study, the investigators will be assessing how well Glutamine affects Short Bowel Syndrome in children.