I work with kids for a living and have developed a pretty strong opinion on this topic, so I felt the need to respond, though I may be the last to respond by now (I was on vacation this week). I've learned from experience and studies DO prove that there is indeed a difference in brain development between children who view tv more than others. Regardless of what they are watching on tv (INCLUDING Baby Einstein, Sesame Street, etc!), with more tv viewing the brain development goes toward increased impulsivity, lowered attention span, increased aggression (I always thought of this term as them being meaner maybe from watching violence on tv when I heard about it from professionals, but from experience I understand it's more aggression in terms of intensity of behavior which makes a lot more sense, and goes along with impulsivity...they just tend to be more intense/stronger in their behavior). As occupational therapists will tell you as well, the trend toward more tv, computer, and video games geared toward young children has brought more business to them because all that screen time hinders fine motor development. Kids NEED to play and manipulate things and interact with things to develop their brain and understanding of the world. The BEST toys for a child's development are various ones that require no batteries/power source. Genetics and who they are by nature of course plays a part and of course determines how susceptible the child is to the influence to some degree I'm sure, but studies show that tv is associated with increased impulsivity, increased aggression, and lowered attention span...and I've really seen correlations in kids I've worked with! 3 months is young to worry too much about them wanting to watch tv, but it IS the time to determine world view and what you want to prioritize, so it's great you are thinking about it so early. She will be perfectly content playing with toys and the regular "old-fashioned" toys really help development...the colors and movement on tv draw the attention of babies, but it's really not good for their development to place them in front of the tv, as the studies show! They don't "like" it so much as it is instinct for them to watch the changing movements on the tv, from what I understand/have read. Personally, I made the decision that we will not own video games or watch tv routinely. So my kids do watch tv occassionally, but by no means is it daily. They consider it more like a fun movie night when we watch something, as opposed to just part of life. I use it when I'm in desperate need of getting something done (like taxes this time of year when I can't do it all while they are in bed) or special occassion. We're intentional about it. Honestly it's more in the winter (though still not every day by any means) than in the summer as they can spend a lot of time outside in the summer and we all get cabin fever in winter a bit. But I made the decision early to keep tv out of routine at home and not own those trendy video games, so it's not a temptation or slippery slope for it to become daily routine. They play computer games at the health club sometimes, and video games sometimes at friend's houses or McDonald's playland along with the tubes there. I feel I don't need to limit it other places if it's just not so available all the time at home. Make sense? It's so easy to rationalize that I hear many people believe it's not too much at home if they are at school all day without it, or that it's just an hour or two a day. An hour or two a day is A LOT, and studies show that's plenty for there to be a negative effect. "Too much tv" I've found is a VERY relative thing because nobody wants to think their kid watches too much tv, but it can be such a slippery slope. Some also rationalize saying their child is not even watching the tv, but their show is just on while they play...oftentimes this is because they no longer maintain the attention span to watch it and need to be doing other things at the same time, revealing the hard time that may be to come when they need to focus in school and such. Music would be a much better option if background noise is what's wanted. To do your own research, look for valid sources when you google "toddler and televion viewing", "attention span and tv", stuff like that. The professionals say that under 2 years old, they should watch NO tv, which is a bit unrealistic if the parents watch tv shows which most do, but the reason for that is because the young brains are still developing so much and the way they develop is PERMANENT structure, so sitting them in front of the tv intentionally, or allowing it to be routine as they become toddlers really does them a disservice as it could lead to a lifelong struggle with paying attention to the task at hand, a struggle with impulses, etc. So Kudos to you for doing your research now and being intentional about it!!! :)
Something else I wanted to add is that educational tv shows do teach kids things fast so parents will often get excited about all their kids learns from tv, but what the shows fail to do is teach them HOW to learn. So that's great they know ABCs early and such, but I'd much rather them learn and discover through manipulating and interactions so they can learn HOW to learn and explore and gain that love for learning and discovery on their own that they can carry on throughout school years! If it takes a little longer to learn ABCs and 123's, what's it matter in the long term if they are learning in the process how to manipulate, learn, and discover. What good will it do as they grow older to have known facts early if it becomes a constant struggle to stay focused to learn what they need to in the school years. Make sense?