Lullabies are commonly described as a universal musical genre among humans and a likely source of insights into the origins of music. This study explores the validity of these claims through a critical analysis of the ethnographic literature, starting with a literature review based on the Standard Cross-Cultural Sample. Lullabies emerged as a “near universal” when defined broadly as any type of singing used to soothe children, but neither as a “near universal” nor a “statistical universal” when defined strictly as a specific category of infant-directed songs. As Indigenous Peoples from America presented more societies with few or no lullabies than other regions did, a second review focused on this area was conducted, highlighting three cases: (1) the absence of lullabies among certain Native American communities, (2) the historical diffusion of repertoires in the Circumpolar North, and (3) cross-cultural convergences and entanglements between musical genres on the Pacific Northwest Coast (complemented with corresponding examples from Polynesia). In conclusion, while the act of singing to soothe children is a near universal, it also presents significant cross-cultural variability. Perspectives for future research are discussed.