This can have an impact on how well a child is able to perform in school and in other areas of their life. Allowing the television to be a baby sitter for your infant is not a good idea.
The long hours of watching cartoons can be better spent doing some other activity. When I was a child a had a very small patch of the yard that I turned into a garden.
I took dry beans from the packs in the kitchen and planted them in the garden. It was a wonderful feeling to watch them grow from a bean to a plant. We never ate anything from my garden, but having it gave me something to look forward to outside of the house, instead of doing nothing but sitting in front of the TV all day.
Even today, more than 30 years later, I still do not watch (much) TV.
There are a lot of TV stations that show programs that are very educational and a person can benefit from these programs. But, a child under the age of three should not be allowed to sit in front of the TV for a long time, the study states that no more than 30 minutes per day is enough.
The long stream of continuous violence shown on TV has a negative effect on a child and adults, as well. Watching hours of violence, fast food commercials and the other nonsense - will have an adverse effect on anyone who watches it.
It is not good to live in a society that doesn't blink an eye when someone has their head blown...