SPAM and theatre all-in-one! Believing your child can deflect bullets effectively by holding an 11" x 14" piece of armor is ridiculous. If you want a Captain America shield go ahead and pay the full price for one of vibranium.
What should your child protect? His/Her legs, head, arms or butt (choose only one)?
the kinetic trauma is difficult to deal with, and not a lot can be done about that with so called hi power rifles.
ricochet is a problem for design. a round can ricochet the surface of the plate redirect and exit the edge striking upperlimbs, or head/neck area. this is mostly a consequence of hit from front. rear not so much but hitting someone nearby is very possible.
What should your child protect? His/Her legs, head, arms or butt (choose only one)?