Words for 'mother' and 'father' sound similar across many unrelated languages.

Across languages with no historical or geographic connection to each other, words for parents cluster around similar sounds: “mama” or close variants for mother, and “papa,” “baba,” or “dada” for father, turning up in language families as distant as Indo-European, Sino-Tibetan, and various Indigenous American and African languages.

Linguists explain this as a byproduct of infant development rather than shared ancestry or coincidence. Nasal sounds like “m” and open-mouth consonants like “p,” “b,” and “d” are among the easiest sounds for babies to produce as they begin experimenting with speech, often before they can control more complex articulation. Because these are typically the first recognizable sounds infants make, adults across unrelated cultures independently attached them to “mother” and “father,” producing a false appearance of a shared root word.