Daily art studio and science workshops built for small children, the Japanese House tours, and the Snowmazing! winter takeover from December through February break.
Details change often — check with the program.
Boston Children's Museum is listed in the GOkidOZ guide to museum classes and family tours across Massachusetts. Class schedules, free hours and vacation-week programmes change term by term — check the official site above for current listings, and see what else is on during winter break.