Baby Calendar is a Japanese information platform supporting people through pregnancy, childbirth, and parenting. It brings together practical guidance, expert knowledge, and community experiences to help expectant parents and families find information relevant to each stage of their journey. The site publishes news, features, personal stories, and foundational articles covering fertility, pregnancy, birth, postpartum recovery, and child development. Users can also ask specialists questions, including midwives and registered dietitians, about maternal and infant health, feeding, nutrition, and childcare.

The platform offers recipes for pregnancy, fertility-focused meals, and baby food, alongside developmental content and family photo albums. Its searchable listings help users find maternity hospitals, gynecology clinics, postpartum care facilities, and related services across Japan, with reviews and facility information. Baby Calendar also provides pregnancy and baby-age settings, and its app includes tracking and recording features designed for use from pregnancy through early parenting. With more than 10 million monthly users, Baby Calendar combines editorial resources, expert consultations, recipes, search tools, and shared experiences in one destination for parents and caregivers.