Awww little guy, Yeah you're fine. My guess is with conservative feedings, he will get to about 6' but you could be surprised if it has any BCC crossed into but I would honestly be floored if it got over 8' especially as a male. Also boas don't grow really fast, much slower than a beeper. Dottie went from 12" to 3' in just over 4 months where as Rosey went from about 16" to about 6' in just over 2 years.