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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.
Crawling up the Stairs at 5 - 12 months. Just like babies crawl before they walk, it's usually how they first start to conquer the stairs, too. And it's the way you should encourage your child to take the stairs until she is more confident on her feet.