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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.
If after the age of 3 and a half years, your child still canât climb stairs by alternating his feet, you should speak to his paediatrician. If your toddler is climbing and walking down step-by-step and not alternating his feet, try not to worry too much unless you notice other signs of weakness.