1. not adverse as long as the content is age appropriate
2. #1 start watching at 4 to 5 months. #2 not even interested even at 7 months
3. I always ask back "so what?"
tbh my child learnt alot from watching cocomelon. he know names of shapes, colours, numbers and all alphabet by 2 years old. Childcare teachers always said he knows more than other kids and asked is it i teach at home. =p