Child seats and helmets

edited May 2007 in MTB general
Took my 11-month old lad out on a rented bike at Center Parcs at the weekend and he loved it, so I'm looking to get my own child seat and helmet now :)

Any recommendations? The Co Pilot Limo seems to be highly prized, though also highly priced! I suppose if it lasts him 4 years it's a good investment though, and obviously safety is most important.

Any manufacturers make particularly good, comfy helmets for tiny heads?