I have some one the way... so I hope so lol.  It should be fine.  Bolton did a great test with a bunch of stuff and Flat out worked best.

Hi freinds,

I just got a Radrunner and trying to find a child seat for my 2yo daughter.  I am having a heck of a time finding anything that will fit that isn't the Thule Yepp.  I like that seat, but it definitely for more petite/younger kids.  My daughter is already 36lbs and stands waist high.  She's bigger then a lot of 4yo kids at the playground... The problem is she's got the control and cognitive ability of a two year old despite appearances.  So we are definitely still in the world of child seats.  Been looking at the Topeak Babyseat II but not sure I can attach it to the runner. They have a weight rating of 48lbs and a little more room for bigger toddlers. Looks like you need their specific rack?  She loves the bike and tells me she wants to go "weee" with me so any help for me and the little miss is going to be appreciated. Looked at adding the Mac Rides seat too, but looks like you would have to cut down the front stem tapered collar to make it fit and I don't know if I want to go full grinder on the bike quite yet.  Haven't even owned it for a week lol...