At 1.5 years old , decreasing the milk intake and increase the solid diet , use Bristol stool chart to know about constipation, it’s available on Google, and it’s free .
If you child is in 1 and 2 categories of Bristol stool chart then PEG is required, otherwise use proper diet ( low milk , high fibre, lots of water
Next Steps
High fibre rich diet and plenty of water intake
Health Tips
Diet modification