TV-Y7 denotes that a show or program is suitable for kids seven years of age and older. This is in contrast to TV 14. Well, TV 14 indicates that a show or program is not appropriate for children younger than 14 years old. This also indicates that children younger than 14 years old can be exposed to material with a TV-Y7 rating. So, you don't have to worry about experiencing any adverse effects on their development because of such material.