I have a Light Brahma that I got along with a Speckled Sussex and a Cuckoo Marans.. they are gonna be eight weeks Friday.. they are all pretty much the same.. the CM is the biggest.. then the LB.. then the SS.. Lilly is in the middle..
My 2 at 5 weeks are 1/2 again as big as the Favorelles and gigantic compared to the Silkies. Gracie is the biggest posing for the camera, and then the gang.
Hatchery type Brahmas grow about the same rate as most other hatchery breeds. Better quality bloodlines are much slower growing. Mine don't reach their full size until about 18 to 20 months in age.
She is the larger buff. Frankie is the smaller. Frankie is about the same size as the Favorelles. The Favorelles did this big growth spurt. Gracie was huge when they all arrived and still is by far the largest.