My little girl is 28 months old and until four months ago we thought she was ok. She had terrible diarrhoea for four months and doctors thought she was small and pale. Stool samples show she has exocrine pancreatic insufficiency of -15 for July and August was -18. She's been tested for cystic fibrosis and celiac to which she's negative for both. They want to do more blood and stool samples. She is just under 30 lbs and is very short for her age. She doesn't register on the charts. Does anyone know if it take weeks months to be so severe pancreatic insufficiency. She has history of constipation or diarrhoea and stunted growth. Any advise please xx