my baby was the same and even worst when she was 4 and a half month old. she refused to take in milk even after 10hours !!!! My parents said it was all becuz of her growing teeth wor. The situation went on for nearly 2 weeks!!! I was very worried at that time. ?-( :-(
But after two teeth came out, her situation is back to normal.
I remember that at the worst day she drank less than 10oz of milk within 24 hours~!!!
You have to be careful at this stage. Babies get sick easilly when they eat so less.