Place a baby gate at the top and bottom of the stairs. Use gates that are installed by screwing or bolting them to the railings and wall. Pressure-mounted gates seem desirable because they do not damage the walls, but if a baby pushes hard enough against a pressure-mounted gate, the gate may release and the baby may fall down the stairs.
Measure the distance between the spindles of the railing. If they are spaced wider than the slats on a standard crib (about 2 3/8 inches), install a railing net. Railing nets cover the railing so babies can't fit their heads or bodies between the spindles.
Move objects away from the railing. Babies can quickly climb onto both decorative and day-to-day items and then topple over the railing. Keep portable items or items on wheels tucked away so the baby can't push them over to the railing and then climb on them.