• Neonatal voiding: small frequent voids every 1-2 hours
• Dry at day at age of 4 years
• By the age of 5 years:
• Children should be continent both by day and night with increasing bladder volumes
• Normal urinary frequency 4-7 /24 hours
• Expected bladder capacity= (age/years+1) x 30 ml from 4-12 years
• Bladder capacity from age 12 years – 390 ml