Which comes first, the stage or the learning? Vogotsky and Piaget differed somewhat on this question, but for us parents, the important thing is this: provide a variety of experiences for your child, allow her to make her own decisions, participate with her in discovering the world, and above all, communicate with, not at, your child.
Why am I talking about "learning" on a blog about parenting? Because everything you do in your child's presence is teaching your child something. Every action requires a decision, whether you realize it or not. So think about what you are teaching your child in the moments when you're not really thinking about what you're doing. An aware parent is a better parent. That's how you --and your child-- grow best.