her baby is sleeping on upstairs 错在哪

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her baby is sleeping on upstairs 错在哪

应该是her baby is sleeping on the stairs.
upstair 是副词意思是在楼上,而the是定冠词不能放在副词之前
楼梯是stair

开头没大写,结尾没写句号,还有不用加on,upstairs已经是副词了,不需要on

upstairs 是副词, 不需要on

upstairs 前面不需要加on

不用on

应该是:her baby is sleeping in upstair.

应该改为:Her baby is sleeping on the upstair.