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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.
Alternating Feet on the Stairs. The skill of alternating feet while climbing up or going down the stairs isn't very refined until sometime around the end of your child's third year. Full mastery of this will not occur until about a year later, possibly as late as 5 years of age.