Lamont, who has made one appearance for the first team this season, is un the under-19 squad that is due to play Denmark twice this week.
Stewart is in the under-15 squad to face Belgium in the next few days.
Well done lads!
Story source: The Official St. Mirren Website
Follow Mirren Mad on Facebook at http://www.facebook.com/pages/Mirren-Mad/177833938918587
Follow Mirren Mad on Twitter @mirren_mad or http://www.twitter.com/mirren_mad