I would contact your child's pediatrician to find out what could be causing this. My intial reaction is to ask, "What is your child eating?" Or perhaps, what has changed in your child's diet, or what has he recently been exposed to?
Doing a rather quick Google search for "yellow bowel" suggested this might be due to liver function. This NOT being my area of expertise, I would strongly advise you to consult with a pediatrician and / or gastroenterologist.
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