Thanks for your reply so far. You say my diet may be the cause, but I eat a pretty healthy diet so don't know which foods could be a problem. Can you suggest any foods to avoid? The only possible problem with my diet is a calorie drink I am prescribed, called Ensure Plus, since I need all the calories I can get with breastfeeding and was a bit underweight. Ensure is high in sugar (therefore starch), but I have been drinking it for a year without previous problems.
(I promise I will pay - I will not forget)
Can I just confirm that the payment will be £10? I am happy to pay that amount, but do not wish to be charged more than this.