Yes! They have the Imprimatur and Nihil Obstat from the Archdiocese of Chicago.
The books have also been given the Declaration of Conformity by the United States Council of Catholic Bishops (USCCB).
They are intended for young people aged three years and beyond. However, although they are simply written,
the concepts are not 'dumbed down' so they can be instrumental in the religious formation of older children as well.