You can definitely carry a 4 year old, they are portable for a reason.
Madness string 8931
How did I survive? With a piece of nothing that held back the nothing. Nothing can stop nothing, you know, and so I carried nothing in my hand to protect me.
The reason that I don't use a yo-yo in my live performances is that my previous attempts at yo-yoing have ended with my being struck in the genitals by a yo-yo.