system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Would mother's protection magic kick in if Voldemort just stabbed baby Harry?
gpt
We don't know for sure, but the protection did extend from not only magical but physical attack. 

When Voldemort-possessed Quirrell tried to strangle Harry, he found his hands burning and blistering.

I would hesitate a guess that yes, it would save him, perhaps by causing the knife to heat up and shatter on impact.