I had 104 fever for a few hour during the 4th week of my pregnancy. now i'm in my 18th week of pregnancy. i'm worried that has my fever caused harm to my baby?

Unlikely: A serious condition early in pregnancy will cause a miscarriage. If it were later, say now, it could e a rare transmit tile virus but at 4 weeks it is typically an all or nothing deal. You should have a relationship with a healthcare provider to answer these questions; hopefully you are just looking for another opinion. Good luck, merry christmas.

Most likely not : I know the media are full of the danish study that pregnant women who reported having the 'flu had twice as many children with autism; women who reported having fever for > a week had 3x as many, & women who required antibiotics had a slight increase. . However, these were self-reports by phone. While it's worth getting a flu shot, no harm was done by short-term illnesses.See www.Aap.Org.