I heard/read that u should NEVER, i repeat, NEVER let a child younger than 7 years play with 3D effect.
It's BAD for them. also for older children, but less.
the 3D effect is bad for everyone's brains and eyes.
B cuz a 7 year old/younger's brains are still growing, the 3D effect is VERY DANGEROUS.
Its your own choice to let them play with it, but think about their brains.
kbaithx