Babies love to master a new skill.
Once they do it, they want to do it again and again. The danger at the top of a flight of stairs is obvious to most parents, but keep in mind that if your baby can climb up a flight of stairs, which may happen before he learns to walk, once he climbs up he can fall down. Keep gates at both ends of a flight of stairs to protect your baby from falls. Walkers are a great diversion for infants, but they provide no developmental benefit. Infants don't learn to walk by being in walkers.