How far can you ride with a baby?

[pll]

Trailers are much safer and more comfortable for the baby. They can nap with more support to their neck and whole body. You can also bring more toys snacks diapers whatever along.

Let me just add something from watching some friends of mine: kids fall asleep easily, making neck support a bigger issue. My friends took their oldest kid in a bike seat as toddlers. Within less than 2 hours, the kid was asleep.

[Irulan]

more on the backseat safety issue... I missed at first that you want to put a baby seat on the back of the tandem... Let me ask you this, have you ever ridden the tandem with 15-30 pounds of dead weight on the way back? It's hard enough for single person to hold the bike up when putting a foot down with that on the back, let alone the captain of the tandem dealing with it. Yikes!
If the tandem is non negotiable, what about a wee ride Kangaroo? http://www.weeride.com/
These things are awesome. We used similar with our kids before trailers were out. The kid is out front, not looking at your butt all day. The center of gravity is much more stable, and they are closer to a parents voice and face.