Mother's little helpers: What we know (and don't know) about cooperative infant care in callitrichines

This is the peer reviewed version of the following article: Mother's little helpers: What we know (and don't know) about cooperative infant care in callitrichines, which has been published in final form at <https://doi.org/10.1002/evan.21516. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.