Urinary - Developmental Aspects

Question 1

How many times does a newborn void a day? Why?

Answer 1

5 to 40x

Urine cannot be concentrated

Question 2

How much does a 4 month old void compared to adult?

Answer 2

4 month old = 400 mL
Adult = 1500 mL

Question 3

When does a child develop voluntary control of urethral sphincter

Answer 3

18 months (2 years)

Question 4

What happens to filtration as we age?

Answer 4

Rate decreases and tubule cells become less efficient at concentrating urine, leading to urgency, frequency and incontinence