How easy do you think it is to influence children with advertizing?

In my opinion the children are the best target audience in the world, because when a kid sees a toy that they want, they try to convince their parents. Also that depends on the type of commercial, because if the ad is catchy the kids find attractive, but if the ad is bad the children don't take importance and it is not effective. One example can be when a girl sees a Barbie that has a lot of things, she finds it very attractive and she wants to buy it. In conclusion it is easy to influence children but the ad has to be good.