do you let your baby watch TV?

I've always been very cautious about letting my six month old watch television. She's watched maybe an hour since she's been born. Her older brother likes to watch tv after school etc and since she's become mobile it's becoming increasingly hard to keep her away from the TV lol. Do you let your baby watch tv? If so how much? I feel so guilty that she's watching about 20 mins a day now😩