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1 He/she will likely be using a step-to pattern in which he/she places both feet on each step. 2  18-20 months-By the time your child is this age, he/she should be able to walk down the stairs as well, placing both feet on each step and using a railing for support.
Easier up the Stairs Than Down the Stairs - 2 to 3 years. At some point after your child's second birthday, she will begin to go up and down the stairs supported only by a handrail. You will notice that she masters going up the stairs this way much sooner than going down the stairs this way.