Baby is 11 weeks old and was drinking 5oz every 3 hours but now he's drinking like 2/3oz every 3/4 hours and even then he's crying. He's had 16 oz within 20 hours, even after going 6 hours without a feed (overnight) he wasn't interested in a bottle, he's sleeping more in the day to, he's currently on prescription milk, gaviscon and laxatives. I feel lost I don't know what else I can do, any ideas