The chapter presents the evolutionary perspective on parent–infant love as pair-bonding. These bonds and the attachments of (a) a parent to an infant and (b) an infant to a parent include two major types of love: parental love as care for offspring and the love of young animals for caregivers. The comprehensive review of studies presented in this chapter explains the evolutionary mechanisms that guide these types of love. The author presents convincing research evidence that maternal love for infants became an evolutionary basic type of love, and only mammals became capable of this kind of love. On the other side of parent–infant love, an animal infant develops their infantile attachment and filial love for their mother or other caregiver. The following sections explain how innate mechanisms, imprinting, and learning processes foster infantile and filial love for a caregiver.