The Friends of the Middlesex Fells Reservation host weekly hikes for young families from 10 to 11:30 a.m. Tuesdays, Thursdays, and Saturdays. These “Babes in the Woods” guided walks are free and offered on a drop-in basis. Participants meet in different locations each week to explore areas of the reservation; detailed information about each hike is available at www,fells.org/visit-trails.html. The Friends seek to protect and preserve the ecological and historical resources of the 2,500-acre Middlesex Fells forest reservation. The group is a nonprofit organization that relies on private donations to support its programs. Tax-deductible contributions may be made by visiting www.fells.org and clicking on the yellow “donate” button on the homepage.