Dads, comfortable ba kayo bigyan ng smart phone ang isang three-year-old? Or is it okay to wait when they're a little older?

Answering on behalf of my hubby. Not comfortable because letting your child use smart phone at an early age means exposing him to radiation and it may cause poor eyesight. Instead, I will let him use toys that are appropriate for his age and the kind of toys na magdedevelop or mageenhance ng coordination skills niya.