Autism for infants

So my baby is 12 weeks old she’ll be 3 months in 2 weeks & I heard that if they watch to much tv at a young age they can develop autism or late development issues.. she doesn’t watch tv all day but when my family watches her they like to sit in front of the TV set & Rock her & shell just be looking at the tv I guess because of the colors and everything plus sometimes it calms her down so please give me your opinion because knowing that it may cause that then I will stop.