Best Adult Bike with Baby Seat

There are thousands of bikes in Cambridge, and it is very common to see ones with baby seats. Some seats are directly behind or directly in front of the adult rider's; some are a separate contraption attached via a hitch to the back of the bike. The hitch ones make me so nervous.

Since I started working, I've seen an unusual bike: one with the front wheel replaced with two smaller ones on either side of a metal, half-oval covered with a red plastic with clear windows in back and front. If I had to travel via bike with a baby, I think I'd want this bike.