Not really. My sunglow female was 119g at about 4 months old. If your baby was born in September of 2013, then it is about 5ish months old. 152g is probably fine. Every baby boa is different.
Having said that, it's important to observe your baby's body condition. The OP's baby pictured above, while on the small side, looks very proportional with good muscle tone and has a healthy look about it. Does your own baby look like this?? Or does he lack that lean, muscular look and appear more round and/or thick instead?
If you still have doubts, post a picture! We'll be happy to help you further!