Does teething cause fevers? I've heard some parents say yes and others say no. My 1 year old is just cracking open another tooth, and has been warm (not hot) and sleepy all day today. While she is awake she has been acting just fine, a little cranky at times and a bit needy. But she plays and runs around with a smile on her face. If it was your own child would you say it's teething or would you be calling the doctor?