hypercalcemia can cause bed wetting. Also milk alkali syndrome.
In both cases, cut down on his milk.Absolutely NO milk in the evenings. Also, give him some magnesium to counter the calcium imbalance.
In some cases, it can be an early issue with later diabetes or blood sugar control. This is typically because of adrenal (cortisol) imbalances. Cortisol attached to calcium. If there is low cortisol in the body, the serum calcium will be higher.These hormone imbalances have direct affects on the bladder (and many other organs).
I would start with reducing dairy and taking magnesium. If he can't take magnesium malate pills, there is a product called kid calm, that is magnesium citrate. Larger doses can cause the runs, start slow and work your way up.
Watch for illness signs, especially chronic fatigue or fibromyalgia, that "hit" at puberty, a sure sign of adrenal hormone dysregulation. Early childhood adrenal homrone imbalance signs can be very slight and mistaken for other issues but these are the signs:
Bladder issues (some kids, not all)
Knee pain (could come and go)
Hip pain (come and go or side to side )
Low Back pain (come and go). as the child grows, pain in these spots is more pronounced after excercise, and front thighs. Ankles can get pain at times also.
pain in ears with no infection present. black wax. ear ringing. or hearing loss.(ear issues are low adrenal aldosterone)
recurrent urinary tract infections
Croup or asthma (some kids, not all)
A tendency to sit and "zone out", quietly stare into space or out a window fro 5 or 10 minutes- these could be the child having low blood sugar seizures.
more blood sugar issues: the child could get mania laughing periods, (where it seems they cant control thier laughter) usually a period after eating.
Sensitivity to light, smells, starting to get food intolerances
stomach aches, nausea (on and off)
migraines
Later stages:
Trouble staying alseep or getting to sleep- inability to wake up in morning.
Dizzy after standing from sitting position (some kids, not all)
Evenually blacking out at times, dizzy when standing. worse under florescent lights. (some kids) watch for issues occuring when blood sugar drops (like every 3-5 hrs after eating) Shakey, anxiety, fear, feelings of doom, easily angered, easily upset, combative, cant handle stress-even minor stress, lashing out, wanting to hurt others, - can be misdiagnosed as bipolar/aspergers.