At 14 mos I would get either a bicycle seat (rear or front, whichever you feel safer with) or a trailer. The trailer will last longer, although I've just moved from using a trailer to an Xtracycle and the weight of my kids feels much lighter when it's actually on the bike. Although I have 2 kids weighing 80 lbs total. The weight of your one young toddler might not feel much at all in a trailer.