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Across history and cultures, many societies have recognized more than two genders, which challenges the idea that the binary is natural or universal. The views here draw on feminist, decolonial, and indigenous traditions alongside research that separates sex from gender, and they differ on what recognition should look like in law, family life, and science. Together they present gender as a fluid spectrum rather than a fixed pair of categories.

The exaggerated singsong adults use with infants looks silly but may be doing serious work. These approaches differ on the mechanism and the proof: how parents adjust speech to a baby's feedback, which sounds hold infant attention, and whether the research leans too hard on narrow Western samples. Comparing them shows what we truly know about talking babies into language.