Magick and small children go hand in hand. It's only as we get older that we stop believing in magick. When you watch your children play, that's magick. Their imaginations are very powerful at this stage in their lives, and they use it everyday and every time that they play. Make sure you begin to help them tell the difference between fairy-tale magic and "real" magick.
Focus on the magick of Nature. Show them how magickal it is when the spring comes each year, the buds in the ground and on the tree burst into bloom in full radiance. Magick is a part of daily life, and young children need to learn that concept. Keep it simple, however, if it gets too complicated, your little one will lose interest.