16 week old used to do 6 hours overnight then feed then another 3 then up for the day. Now sleep regression is here has been for two weeks and haven't had more than two hours without having to feed him. Any help please? Dummy and shh pat is no good he wants a full feed. The only thing that's made him sleep is calpol we've gave him two nights over the last two weeks because of his teeth. I am dying here