Matilda has gone through this phase quite a few times in the last 6 months. She didn't eat dinner for 2 months!! I tried everything & in the end I just gave up and 2 nights later she started eating dinner again. She also goes through it for a few days at a time. Her 2 year old molars have been bugging her and she definately won't eat for a day when they are inflamed. They haven't come through yet but I am sure that they are the instigators of the not eating.