<s>[INST] My 17 month old son had a temperature of 100.5 2 nights ago & yesterday, but when he had tylenol, he was fine & playing.  So I figured, teething is happening again but what concerns me is that he threw up 2 nights ago while he was sleeping, that one had milk all over & again last night, but this one was all yellow acid.  This morning so far hes playing and his body is a lot cooler than he was yesterday.  Is this a part of teething too? [/INST] Hi..Welcome to HEALTHCARE MAGIC..I have gone through your query and can understand your concerns..As per your complain mild fever is commonly seen in teething infants and toddlers however recurring fever can also be due to viral infection while throwing up can be signs of stomach infection that is also common in infants due to prematurely developed immunity..In case if it is due to teething it is commonly associated with other symptoms like sore, swollen and bleeding gums, irritability, drooling etc..I would suggest you to consult a Paediatrician and get him evaluated and a thorough clinical evaluation and investigations like blood test can help in diagnosis and treatment can be done accordingly..As of now you can give him Acetaminophen to relieve fever..You can also feed him with plenty of fluids and give appropriate rest..Hope this information helps.Thanks and regards.Dr.Honey Nandwani Arora. </s>