when did you first give (or plan to give) your LO peanuts or peanut butter?

i've heard about waiting 1 year, but have also heard 6 months, and then our pediatrician said 2 years! i have no idea what to think.

my friend told me that she drove to her pediatrician's office and gave her LOs their first taste of peanut butter while sitting in the parked car, in case they had an allergic reaction. i hadn't thought of that idea, but am probably paranoid enough to do it.