#askexperts My daughter is 4.5 year old.She had severe cough with 99 fever but no phlegm came out during cough. After continuous coughing one time white phlegm came out along with food and after severe cough there was an yellow liquid that came out. This happened at night while she was asleep. Throughout day she was active,though was coughing,had food and also pooped. What does the yellow fluid vomit!?is it a matter if concern or is it due to congestion