There came to my attention that Imām ibn al-Qayyim رحمه الله shares in his Zād al-Ma’ād that many men get born while circumcised. He says that this is the reason why doing circumcision was not a particular attribute of the Prophet صلى الله عليه وسلم.
The Imām mentioned that in this way:
وليس هذا من خواصه، فإن كثيرا من الناس يولد مختونا
Zād al-Ma’ād, 1/80