THE ABC'S TAKE ON THE ISSUE

See here for their reasoning, especially the following paragraphs:

Play School aims to reflect the diversity of Australian children, embracing all manner of race, religions and family situations.

Segments have included families from a range of social, ethnic, religious and racial backgrounds. In most cases the focus is on aspects of family life with social, religious, cultural or racial aspects forming the background only.

However, there have also been segments on a child's christening, celebrating the Jewish holiday Chunakah (Hannukah), a Muslim family, a child as bridesmaid at her grandmother's wedding and similar circumstances.