I think Sick Kids is the best place - http://www.sickkids.ca/Craniofacial/...mas/index.html
We're seeing a pediatric plastic surgeon at the IWK in Halifax.
Most of the pictures and stories you'll find on the internet in general can get pretty scary - the ones that grow enormous get the most news time. From personal experience and reading other posts on this site, I think most H's are relatively small. Treatment, if any, depends on any number of factors, including size, type (deep, compound, etc), & location (near eyes/ears/etc generally are monitored closely and removed if interfering.)
Canadian doctors are much more likely that their US counterparts to go for the wait and see approach first. If this is fine with you (and it was with us) then there's nothing wrong with that. But if you want it treated and/or removed then you may need to advocate a bit more for your child.
As for how fast they grow, in our experience, with our youngest, there was rapid growth for the first few months followed by steady growth up to 9 months then slow growth to a year, then nothing until involution started around 17 months. With my oldest, his stopped growing around 6 months and is nearly invisible now at 3.5 years.
(As an aside, were you on SH years ago? If so, good to see you again and congrats on the newest addition!!)