[Avodah] Correct day for Berit Milah

[JOSEPH MOSSERI]

A woman gave birth to a baby boy on the 2nd day of Sukot (Yom Tov Sheni shel
galuyot). Normally the Berit Milah would be 8 days later which would be on
Simhat Torah day also Yom Tov Sheni shel Galuyot.
The question is as follows: The birth was not natural rather it was a
C-section.
When is the Berit Milah?
On Simhat Torah, Yom Tov Sheni Shel Galuyot or on the next day which is Hol.
Please provide all sources and explanations.
Thanks,
Joseph Mosseri
(Should this question be on Avodah or Areivim?)