11 month old stomach bug

Julia💎 • 26 | Mother to my handsome toddler March 16, 2018💙

My 11 month old started vomiting last night and can’t keep anything down (even water). Also won’t even try to breastfeed :/ poor thing has been asleep all morning accept when he starts to throw up which is all bile at this point. At what point should I call the doctor ?