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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.
By 15 months the average child is pretty good at walking and likes to push and pull toys while he toddles. At about 16 months, your child will begin to take an interest in going up and down stairs -- though he probably won't navigate them solo for a few more months. Most 18-month-olds are proficient walkers.