Hello
Don't start on medication immediately as kids may get dependant on it
If it's for the first time then u should wait
If he has it very frequently we need to Investigate the cause of constipation in detail.
Next Steps
Increase fibre in diet -- fresh fruits , vegetable,salads
increase water intake --8-10 glasses of water
no fast food
movicol liquid --2.5 ml BD with 50 ml water
Health Tips
if he has it frequently and gaining weight or any other symptoms
we need to investigate for hypothyroidism