Mom C:"Everyone born from man has a sinful status with God" - why? Did God choose it, or did he have no choice?

Certainly a newborn baby has no responsibility for its actions (and practically no freedom of action). Why, then, would it have a "sinful status"? Did the Christian god choose to make it that way, or was he unable to make things less unfair?
Update: purr: so you're saying God was unable to create the world in such a way that babies would be sin-free. Gotcha.
Update 2: NCWJ: so newborn babies choose to sin. Thanks for explaining your views.
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