My sixteen month old had yellow diarrhea now for about 2 weeks...he went to whole milk and then I went back to just straight formula for 6 days to see if it cleared up a little it didn t just wasn t as yellow but was still pooping 4 to 5 times a day still...3 molars are coming in at once I know they say that doesn t cause it but my other two kids def had diarrhea when teething....is it a stomach infection, teething, lactose problem...no fever, seems happy during the day was never a good sleeper so still wakes 3 or 4 times a night...was wondering if I should go to the doctor tomorrow??

Summarized question: What causes diarrhea during teething?