Ok preparing to be flamed for this one and yes it’s probably a TAAT, but why do so many feminists use the recent (Psychological/Sociological/American according to OED) meaning of gender and deny the much older meaning as a synonym for biological sex, which is the one that the vast majority of people are using in the context of babies?
Gender as a synonym for sex is meaning 3a in OED and dates from 1474 while the new meaning (3b) is a US import first recorded in 1945.
What’s stopping us from reclaiming the older and, outside of academia and special interest groups, far more generally understood meaning?