In the 1950s, Lillian M. Gilbreth et al. carried out research focusing on issues concerning child care in domestic work in order to facilitate improvements in child care. However, in the present day Japan, support for female child care providers is still lacking and there remain problems to be solved. Therefore, in this study, we acquired and analyzed the six-month life logs of mothers raising infants in Japan. We examine the mothers’ actions, extent of activity, and physically demanding actions (actions requiring much physical effort) in child care, which change according to the monthly age of the children. In addition, we suggest methods and specific services for child care support in Japan on the basis of analysis results.