Here is a guide to help date your Mama doll according to it’s body style.  In 1927 Mama dolls had slimmer bodies and partial composition lower legs were introduced, about 1928 composition swivel shoulder heads with full composition limbs thus the dolls could stand unaided. 

Around 1935 Mama dolls appeared with distinct right and left feet, rather than both feet exactly the same.

By the mid-1940s composition Mama dolls popularity had declined, doll makers began to replace composition with plastic invented during World War II.  By the early 1950s most doll were made of hard plastic, those makers are listed on this page.

Many, too many Mama dolls are look a like’s and unmarked making it nearly impossible to identify a Mama doll with certainty.  Does not mean you shouldn’t ask for help, to do so though.

List of known of composition Mama doll makers or distributors

(1920s to 1940s American USA companies who made composition dolls, would have made Mama dolls)