When is too soon for ducklings to eat layer feed?

[Momma*chicken]

Here they were last week next to the adult Rouens

 

[New duck mommy 2021]

Here they were last week next to the adult Rouens View attachment 3087736

They look bigger then my 1 year old Pekin
She is the mom to the other ducks in the picture. The boys are bigger then her and the girls are smaller like dad the khaki

 

[Momma*chicken]

They look bigger then my 1 year old Pekin
She is the mom to the other ducks in the picture. The boys are bigger then her and the girls are smaller like dad the khaki

Wow that one is 1 yr old?? Yeah mine do look bigger. Mine are only 7 1/2 weeks old