Let me try to put it a different way,
My babies are born about 14 - 20 inches and about the thickness of a good size pen. At that size they fit very well into a small shoe box size tub (about 14" x 8" x 5" give or take).
For my keepers, at about 9 months old they've outgrown the shoe box and have moved into a sweaterbox sized tub (about 17" x 11" x 6"
. By 12 - 18 months, they've outgrown the sweaterbox and are moved into either a blanket box (23" x 16" x 6"
or into a full size cage. By 2 1/2 years old they are mostly grown, kind of like a teenager, pretty much full size but have some filling in to do. At that age, most are ready to breed but there are some that are just not quite ready and take one more year to mature and fill out enough for breeding.
Of course, individual growth rates will vary.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
24.36 BRB
19.19 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

