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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.
10-15 months-Around the time your child starts to walk, he/she should be able to completely climb up at least 2 stairs on hands and knees. 15-18 months-Shortly after learning to climb up the stairs on hands and knees, your child should be able to go down the stairs in the same manner. At this age, your child should also be able to begin walking up the stairs using a railing or your hand for additional support.