There is yellow and there is YELLOW. My son was a little jaundiced after birth, but I brought him to the pediatrician who was also a talmid chochom, and he called the mohel personally to discuss the bris with him. Both of them agreed and the bris was done on the 8th day, my son was wonderful, B”H and all is well. My friend’s son had a baby whose bris was delayed for weeks because he was premature. Clearly seichel has to be used by the parents to understand the ultimately the health of the baby has to come first. It is frustrating to not be able to call the baby by name for weeks, sometimes, but the bottom line is pikuach nefesh is first.
ISn’t there a halacha that if a certain number of male children bleed out (such as hemophiliacs)as a result of the bris, that no other male children are given a bris in that family? Now that seems harsh, but it is soemtimes necessary.