The new buzzword in parenting is a mashup that will alarm even the most liberal of grammarians. A “theyby” is a baby born and raised free of the constraints of gender designation, according to an article published earlier this week by New York Magazine’s The Cut. Some new parents are adopting the childrearing practice, which includes keeping the baby’s anatomy a secret from others and referring to the child only by plural pronoun, in an effort to raise a more creative and uninhibited human. This article in AdAge discusses some of the ways that marketers are trying to appeal to parents of theybies.