First received a set as a gift for our five month old granddaughter. Liked them so much we bought a set for our goddaughter's newborn and a friends one year old granddaughter. Very versatile. First they are just fun to chew on, but later the letters will be a great learning tool.
The A-Z Letter Links help my little girl learn her letters while providing something she can actually put in her mouth without destroying it--and my older daughter can practice spelling words with them. Fun for all ages!