(approximately between the ages of 9 and 12) The five stages of puberty are called the tanner scale and consist of the following. Here is the list of tanner stages during puberty and what to expect at what age range. The wetness he is waking up with is almost certainly precum what is happening with the night time erections and nothing to be concerned about, his foreskin sounds fine and he is a lucky boy if he can retract it fully already when flaccid and erect as a lot of guys still have problems in there 20s doing that, even though the penis can grow in length into the early 20 for late bloomers I would think he has probably reached his maximum length already, foreskins can come in many different lengths some being so short the automatically retract during erection to expose the complete the complete glands while others only retract enough to only see tip of the glands and the urethra while others are so long they expose nothing when erect.
He sounds like a normal curious 11 year old that's just starting puberty and I would say probably in the next few months he will start to grow a few strands of pubic hair around the base of his penis and on his scrotum, as he enters more into puberty he will notice his penis will start to fill out more his festivals will swell more and his scrotum will hang lower and it's perfectly normal for one testicle to hang lower than the other, at what age did you first notice his penis was abnormally long?
