Youngsters one is a runt
2 pair of my stock birds took ages to lay and when they hatched all was fine then as the got older one got much bigger than the other and developed faster than the other this has happed in both pairs, my other pairs have been fine.
What do you think it could be?
May not be anything, but could be one getting lions share of feeds, remove biggest when feeding then replace when other has been fed, also remember like all animals we all vary in size
Sadie's Loft's, home of great birds, just a poor loft manager