Parent's use of apps to support their parenting is on the rise. The purpose of this narrative review of the literature is to explore the characteristics of research on parents' app use in the first year of parenthood, types of apps available to parents, and the factors that encourage or discourage parents' app use. A narrative review of the literature and thematic analysis of the full-text English language articles between January 2000 and December 2019 relating to parents' use of apps in the first year of parenthood was conducted to provide a comprehensive overview of the existing literature using seven academic databases: CINAHL Plus with Full Text, MEDLINE, SocINDEX with Full Text, PsychINFO, Academic Search Complete, Web of Science, and Google Scholar. Forty-one articles were included based on prespecified eligibility criteria. The majority (n=30) discussed a parenting app or mHealth intervention that included an app. Most studies (n=15) recruited women as participants and were conducted in Australia (n=10). Thematic analysis of the eligible articles (n=41) revealed four themes: (I) increased app use related to shifts in parenting trends; (II) types of apps available to parents; (III) apps to overcome the digital divide; and (IV) factors encouraging or discouraging app use. Although numerous literature reviews have been conducted to explore parents' use of online resources, none of the reviews specifically focus on mobile apps developed to support parents in the first year of parenthood. This research advocates that health professionals and researchers should find alternatives to standardized means of delivering and developing parenting social support to fulfill contemporary parents' needs.