It does take some kids longer to fully control their bowel habits. Most likely culprit is the sugar content from the fruit Might be worth giving something like Metamucil a try ( maybe 1 dose after dinner). It will help to "firm" stools when they are runny. Works both ways (for constipation and loose stools). Just be aware to introduce slowly as it may increase flatulence/gas in tummy initially if DS is prone. It will settle over a few days. HTH.