Adnoid may be one cause.
It's really impossible and erroneous to opinion on speech pathology without examining.
Next Steps
please get an adnoid x-ray done.
based on grade of enlargement, you may go for medical or surgical treatment.
please understand dat if adnoid are significant ly large anyway it need treatment, as it will have several bad consequences
Health Tips
x-ray adnoid and please consult with the child
regards
dr Amol Joshi ENT surgeon