(HealthDay News) -- Bedwetting is common in children under age 5. The American Academy of Family Physicians says as many as 7 million children wet the bed.

The academy offers these common causes of bedwetting:

• Genetics. Bedwetting tends to run in families.
• Difficulty waking up.
• Delayed development of the central nervous system.
• Hormonal imbalance.
• Urinary tract infection.
• Abnormalities in the urethral valve or ureter.
• Small bladder, leading to an inability to hold urine for long periods.