What is the ruling on making up for the day I reached puberty in the middle of Ramadan? Is expiation (feeding) or making up the day (fasting) required? Is it permissible to delay making up the day until after Ramadan?

If a Muslim fasts the Ramadan (definition) in which he reached puberty, there is no need for him to make up or feed the poor if his intention was for the obligatory fast after puberty, because his fasting before puberty was supererogatory. As for the day of puberty itself, it is considered a supererogatory fast, so it is not obligatory to fast it or make it up according to the Maliki school and those who agreed with them. Scholars differed on this issue, and this is the most preponderant opinion due to the lack of evidence necessitating making up the fast.