First flying experience for young child

Howdy all,

I have a young daughter (currently 17 months old) who I am looking
forward to taking up in a plane some day. I have a private pilot's
license and typically fly C172s, Pipers, etc.

I feel she's too young right now, but as soon as she's old enough to
understand most anything we (my wife and I) say to her, we will
consider taking her for a ride.

Has anyone else taking their youngin' for their first flight? What
about seating (carseat compatibility in abovementioned planes)? Are
there headsets for smaller heads? (I didn't see any at Sporty's, at
first look). What else did you do to make the flight as enjoyable as
possible?

Thanks in advance!
Dave M.