“Wa ṣāmā mā baʿdahu” requires fasting the following Ramadan days after legal responsibility is established.
For example, a person embracing Islam at noon on the 12th of Ramadan abstains for the remainder of the 12th, then fasts properly from dawn on the 13th and later days. The special treatment of the conversion day does not extend to every remaining day.
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Kitab al-Sawm: Interrupted Voluntary Worship, Puberty and Conversion
“Wa ṣāmā mā baʿdahu” requires fasting the following Ramadan days after legal responsibility is established.
For example, a person embracing Islam at noon on the 12th of Ramadan abstains for the remainder of the 12th, then fasts properly from dawn on the 13th and later days. The special treatment of the conversion day does not extend to every remaining day.