Child still wet's bed at night

  My son is 5 years old and he still urinates his bed, he has a 7 month old brother I have red that this is normal but my concern till what point.
  Should I punish him for this behaiver ?
  I am really concern about it, please help me.

[hfhs M.D.-AK]

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Dear Marcos,
Enuresis is defined as an involuntary discharge of urine but is imprecisely used to describe bed wetting.  Approximately 15% of normal children still wet the bed at age 5 and this gradually becomes more of a concern once the child enters school.  It is not until the age of 7 that dryness is expected by your child