Q1: Can doctors use preimplantation genetic testing to choose facial traits?
No. Preimplantation genetic testing evaluates chromosome counts (PGT-A) or screens for specific monogenic disease mutations (PGT-M). It cannot sequence or select for complex, polygenic cosmetic traits like eye shape, facial width, or bone structure.
Q2: Why do some people claim IVF babies look unusually symmetrical?
This is confirmation bias. Parents who achieve pregnancy after extensive fertility care often document their infants extensively online, sharing styled photography that showcases normal infant symmetry. Scientifically, 3D imaging studies confirm that facial symmetry levels in IVF children fall within the standard distribution seen in spontaneous conceptions.
Q3: Does blastocyst culture media leave physical changes on a child?
Laboratory media supports cellular metabolism, dividing energy substrates and amino acids as the embryo grows to day five or six. While minor epigenetic methylation shifts can occur, they do not produce cosmetic markers, cranial alterations, or structural changes to infant appearance.
Q4: Do babies born using donor eggs resemble the birth mother?
An infant inherits nuclear DNA exclusively from the egg and sperm providers, meaning physical resemblance derives genetically from the donor. However, recipient parents typically select donors with phenotypic traits similar to their own, leading to natural family resemblances.
