My fully latched on 11 weeks old baby vomit yellow kind of liquid/chuck. What is this so? He has 4 to 5 wet diapers, no fever. He is latching on well too.

hmm.. If baby is still behaving normally, should still be alright. That being said, I would still recommend consulting a doctor if I were you. Just to play safe as it is not a normal colour. Hope it is nothing serious!!