[Avodah] Child Convert

[Joel Rich]

A non-Jewish baby boy is adopted by Jewish parents and converted by the beit din.  As per halacha when he reaches 13 he is asked whether he wants to be Jewish. if he responds I’m not sure, what is his status at that time?  When he later makes up his mind, What is his status at that later  time? does it depend whether he decides to be Jewish or not? is there a retroactive impact?
Kt
Joel Rich