Thank you for your query,
Your child might be having the bladder problem due to compression of nerves due to spina bifida
Still developmental immaturity may also a contributing factor for his bladder dysfunction
These children are prone for urinary tract
infections due to stasis of urine and urinary tract manipulation to catch the urine.
I advise you to go for complete urine examination and for urine culture and sensitivity to detect infection.
You have to put the tube till you get the urine, but don't put the tube without the training and supervision by a healthcare worker.
The amount of urine depends on the capacity of the bladder and the status of hydration.
Give plenty of water.
Antibiotic may be required to treat the infection.
So consult your Pediatrician
for the examination of your child and for treatment.
Hope I have answered your query.
If you have any queries you can consult me in future on Healthcare Magic.