How does aspirin affect the development of a fetus?

Answer 1

Aspirin-based pain relievers are a cause for concern because of the possibility, though rare, of interaction with viral activity to cause Reye's Syndrome, a serious disorder that can lead to brain and liver damage. The AAP pediatrician group recommends not giving aspirin to children or infants where fever is present, except as prescribed by a physician.

Answer 2

Yes, aspirin can hurt a four week old fetus. Women who are pregnant are advised not to take aspirin or ibuprofen during gestation.