I don't have a website for you to reference what I am going to say, but I'm sure if you google -- you can find a million.
Basically, under the age of 2, children should not watch television at all (American Pediatric Association).
Then over 2 years of age -- limiting t.v. watching is strongly recommended (no more than 2 hrs.).
Television at your baby's age (5 months) or under 2 years has an effect on the young developing brain. I have the Baby Einstein tapes & even those are not recommended. Some studies have even shown that those children incline for ADHD -- their conditions are exacerbated by television watching.
Put your baby in front of a window to watch outside -- it will be just (maybe more) interesting to her:)
Congrats on your new little one!