My son just turned 20 months and he can’t walk up or down the stairs ( will go …

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My son just turned 20 months and he can’t walk up or down the stairs ( will go down on belly ) and crawl up them tho. He can’t walk out the back door he goes down on his knees and slides out on his belly same with a kerb when out walking he won’t walk off it he will go off it backwards on his belly? I have had two other children and they have never done this would u say it’s normal for his age? He was taking steps at 11 months properly walking by 12 months x
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