How much of miralax (polyethylene glycol) i could give for 2 weeks old son?

NONE: Miralax (polyethylene glycol) is too strong to give to your two week old son. Try instead to supplement with a little water 2 ounces twice daily or you can add 1 tsp of dark karo syrup to 2 bottles per day.

Why?: 2 weeks is awfully young to treat constipation with miralax (polyethylene glycol). Breast fed babies can go weeks without stooling and typically don't need treatment unless they are very uncomfortable. He may need to be evaluated for less common conditions like Hirschsprung's disease. Perhaps you could try a glycerin suppository first? He should see his pediatrician.