This sounds like a problem called toddler's diarrhoea. This is often due to or caused by too much fruit and fruit juice in the diet. Stop all fruit and especially fruit juices and see if she improves. Once she is better gradually introduce fruit again giving her mainly apples to eat, but still no fruit juice. Apply Bepanthen nappy cream to her rash at least 3 times a day until the rash has cleared up.
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