Everything I read says no TV until they're 2. I have one friend who had a Yo Gabba Gabba for her 1st birthday party because she was obsessed, so she obviously watched TV early. And I have another friend who's 3 month old will watch TV when she's doing stuff around the house, and she'll actually sit there quietly.
My LO is 4 months old and occasionally I'll have it on in the background and she has no interest yet. Which I'm ok with. When did you start letting your LO watch TV?