The phrase "baby tongue" refers to when someone is speaking or talking in a very gentle or soft manner, similar to how a baby would babble or speak softly. Full definition
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Contrasting the mechanical aspects of breastfeeding with bottle feeding, Weber13 noted that in breastfed babies the tongue action appeared to be a rolling or peristaltic motion. (brianpalmerdds.com)
Sometimes babies tongues don't function optimally and there are various exercises that can help improve this. (milkontap.com)