My 3.5month old doesn't take feed properly. Before she use to feed for 15-20min every 2.5-3hr. But now feeds for 5min for every 3hr and then stares the surroundings even it is dark. If tried to feed, starts crying. Sometimes mimics vomiting action. Sometimes drinks for 10min & rarely 20mins when she is asleep. This has been continuing for more than a week now. I have tried to keep the surrounding boring, silent & dark. Nothing works. What can i do about it?!