It's not, but it's a bit much to assume a child would be able to handle it one handed.
You have to realize, the 0.45 ACP has so much power, it can be used at Assault Rifle Range.
With enough skill, you can use a 0.45 ACP pistol just like a backup rifle at the 100 yard range.
That's a lot of recoil.
And in this video, we see that it can still kill at the 200 yard range, it's just hard to aim and stabilize to shoot that far. But professional soldiers often can do that. Two handed though.
https://www.youtube.com/watch?v=VDnsGe0QwhA