This is almost certainly a condition known as 'toddler's diarrhoea' It is NOT due to an infection but is usually a reaction to too much fruit and especially fruit juice in the diet. It is the fructose which is the natural sugar in fruit that causes this reaction. Stop all fruit and especially fruit juice for at least 10 days. Your son can eat grated apple but no other fruit. He can start eating a little fruit again after 10 days but must stay off fruit juice completely.
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