While it is extremely helpful for your child to already know the sounds of the letters of the alphabet, it is not necessary to wait to use these reading blocks. Our Spin-and-Read Blocks come with an accompanying alphabet card that helps guide children on the correct sounds of the letters. Parental guidance in the beginning is helpful for children to see how letter sounds correlate to its written form, and to also see how putting letters together create their own sound. These blocks then reinforce that knowledge and provide endless amounts of practice and exploration through touch, sight, hearing, and speaking.