I started letting my, now, 6 1/2 month old son watch tv at the age of 2 months because it helps with visual stimulation.
I would guess when their eyes open.
I've heard two years, and honestly don't see any reason beforehand. It doesn't help babies with visual stimulation, in fact its bad for babies eyes. If you want your baby to have visual stimulation, take them to a park or play with brightly colored toys.
My DD is 5 months old and I just started to let her watch TV she loves it cause she just stays still watching Dora, Bubble Guppies, Umi Zumi, Diego Im sure it's all the colors that catches her attention lol.
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