Woman with 2 wombs in regards to pidyon haben

Question

There is a medical condition known as "Uterus didelphys". Wikipedia describes it as follows:

Uterus didelphys (sometimes also uterus didelphis) represents a uterine malformation where the uterus is present as a paired organ as the embryogenetic fusion of the mullerian ducts failed to occur. As a result there is a double uterus with two separate cervices, and often a double vagina as well. Each uterus has a single horn linked to the ipsilateral fallopian tube that faces its ovary.

This is understandably an extremely rare thing. However this raises the question, what would be the din in regards to pidyon haben. If a woman gave birth to a boy from one womb then at a different time gave birth to a boy that formed in the other womb, would the 2nd require a pidyon haben?

Answer 1

Someone asked this question online to Rabbi Yitzhak ben Yosef (posek and rabbi of Ramat Gan) here, and he responded as follows:

בהחלט שאלה נדירה ביותר. לכאורה כל תינוק הוא פטר רחם וצריכים שני הילדים פדיון צריך לבדוק האם הם פטר רחם דהיינו שלכול רחם יש פתח נפרד.

This is an extremely rare case. Seemingly, each infant is the"opener of the womb" and they both require pidyon. It would be necessary to check that each womb has a distinct opening in order for them to be peter rechem.

Answer 2

the mishna in bechoros states that a child born after a ceaserian birth does not require pidyon (this is codified as halcha). gemara explains that although he is considered the opener of the womb, he is not the first child, and he is not considered the bechor for pidyon.

We can infer from here, that any child who has an older brother from his mother, cannot be considered a bechor for pidyon, even if he is a bona fide peter rechem. Which would mean that in your case, the second peter rechem will not require pidyon.