Firstly please start proper toilet training, enough of fluid, fruits, salads etc to add in diet and reduce amount of milk in diet
Secondly discourage overuse of laxatives
If resistant constipation, also work up for
thyroid
Dont use dulcolex, looz syrup u can give up to 10 ml, try using intermittently
If all of these doesnt work, meet nearby practitioner, muout works better if required on daily basis