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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.
7. Determine how many stringers you will need. To prevent your steps from sagging or bowing as you step on them, a wide staircase will need plenty of stringers underneath to keep it evenly supported. For safety reasons, the stringers should be spaced between 16 inches (40.6 cm) and 4 feet (121.9 cm) apart.ivide the total rise by the typical rise per step. This will give you the total number of steps on your stairs. The typical rise per step is about 7 inches (17.8 cm), but you'll probably use a different height in your final construction.