Yes, they really don\'t want to eat due to their mouth got ulcer. Give them some cooling things like ice-cream or cold drink to cool down their painless then slowly feed them eat. The food must be more fluid rather than solid one.
My son that time around a week to recover for the ulcers. Slowly he will have appetite to eat food but make him so many excuse to get cold things from me. Every time say mouth pain, then he know have cold things to eat even he is no pain at all.