In the early childhood the Supreme Lord was known as Nimai. One day Mother Shachi gave Nimai sweets to eat, but Nimai began to eat dirt. When mother Shachi stopped Nimai, started speaking Mayavadi Philosophy.
Reference:- https://kids.iskcondesiretree.com/eBooks/Chaitanya_Charitamrita/Chaitanya_Charitamrita.pdf