Midrash for Bekhorot 91:18
עודה שפחה ונשתחררה עודה עובדת כוכבים ונתגיירה משבאת לישראל ילדה בכור לנחלה ואין בכור לכהן
[THE INFANT] WHICH FOLLOWS AFTER THEM IS A FIRST-BORN [WITH RESPECT] TO INHERITANCE BUT NOT A FIRST-BORN TO REDEMPTION FROM A PRIEST.
Sifrei Devarim
"… over the face of the son of the hated one": We are hereby taught that if his head or most of it emerged live (from the womb), he negates the next birth as a first-born.
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