One thing is clear here and that is that your baby's diarrhoea started quite suddenly. He was not ill at the time and has not vomited, just had diarrhoea. Also he did not become dehydrated. It seems unlikely that his diarrhoea was caused by an infection even though his illness started suddenly.Did your paediatrician send a stool for laboratory testing? Your baby may have developed a lactose intolerance. He appeared to benefit from being on the lactose free formula. Of concern is that despite the Questran and electrolytes his stools are still very frequent and loose to watery.I suspect that he has a lactose intolerance but cannot explain why he had such a sudden onset of symptoms. Try him on a soya formula such as Isomil.
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