Does it matter if music and movies made for young children are "good"?

Yes it matters. If they watch any violent or ual movies, it's possible that they could turn violent. Or if they watch movies that swear, they will most likely start swearing at a young age. So yes, it does depend and could effect their growth and development. Also, if they watch movies with drinking and smoking their more likely to start drinking or smoking at a young age also. I think you get the point.