acidfast - It was the same with my daughter when she was a tiny tot. Even if she was raring to go, a ride on the bike seat knocked her out in minutes.
My commute wound up being 2 miles in, 8 mile tour at lunch, 3 miles uptown to a couple brewpubs, then 5 miles home, for 18 miles on the folder. 10-11 mph pace.
Want to ride along on my lunchtime tour? There are some captioned photos in this post:
ZiZZO Forte Review