I'm planning on giving my daughter a more expensive birthday gift than her brothers
Is she more worthy of it? Why do you want to do this?
I want to teach my daughter that she is valued. We all know girls love glamour and glitz.
You shouldn't be favoring one child over the others, especially in such a conspicuous way, because you will make your sons jealous and resentful. You should share gifts equally among your children, and make them all feel worthwhile whenever you can.
It's just a gift. My sons don't know the difference and my daughter feels better.
I don't think you can speak for your sons, because only they know what they are feeling inside. They could be hiding their true feelings, so I believe it's best to try to be as equally loving as you can with each of your children with gifts.