question: 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?