boa growth

Hi everyone. I just had a question for everyone with a columbian boa. I was wondering if mine was growing at the proper rate. She is just over 2 years old....does this look ok?
2.8ft - 0.8lb
3.1ft - 1.7lb
3.3ft - 2.8lb
3.7ft - 3.5lb
3.9ft - 4.2lb (she didn't get any length that shed)
4.2ft - 6.0lb

Is this a normal growth rate? Any comments/advice would be appreciated.

Thanks
Lindsey

Looks good to me. Pictures will tell if a boa is overweight or underweight better though. As long as you can see the muscles down their back and not their backbone, he/she is good to go. 99% of boas are overweight though. Post some pics please! Love the boa pics!