Also, I'd like to add that I disagree that by ignoring a child is to say it's not ok to be frustrated. In our case, this is not true. We have always said to our daughter, even as a baby, 'you're frustrated, we understand, but we will help you'. Even now, as a five year old, she can come to us anytime (and does) and will say 'I'm frustrated, because.....' and we work it out. She has learnt how to deal with frustration in more constructive ways, that it is a challenge to solve a problem and she gets great satisfaction out of this.