Welcome!
Your youngsters should be eating a chick feed or an all-flock feed still. Layer feed is meant for actively laying hens only, and was designed for small breed hens like Leghorns who are in confinement eating nothing else.
So this isn't the best choice for them, especially not now.
Mary
They need to stay on a chick or grower feed until they are laying consistently. They need the extra protein and vitamins in the chick/grower for proper development.