It is an undisputed fact among attachment researchers that children need stability and continuity in their caregiving environment for optimal developmental outcomes. However, anthropological studies show that informal and often temporally limited kinship-based foster care, including changes of children's primary caregivers, is widespread in some cultural contexts and considered normative and thus beneficial for children. Based on ethnographic interviews with Nso families in northwestern Cameroon, we analyzed the dynamics of caregiving arrangements and relational networks during infancy and early childhood. Exploring household compositions, caregiving responsibilities, children's preferred caregivers, and foster care arrangements revealed multiple caregiver networks, with the importance of the mother decreasing and the importance of alloparents and peers increasing as the children grow older. Also, families have fluid boundaries, with about one-third of the children changing households in the first three years of life. The Nso children's experiences reflect a relational cultural model of infant care as a cooperative task and a communal conception of attachment. The results are discussed in relation to attachment theory's claims about universal patterns of development.