Silkie vs Serama

[BerrytangleFarm]

So one 20-week-old Serama just started laying BEFORE her 25-week-old Silkie coop mate. When does the Silkie start laying?

 

[TinyTotsSeramas]

Silkies are also slower at maturing and seramas being the "smallest breed of chicken in the world", they tend to mature faster then any other breed of chicken.
Think of a feild mouse and an elephant. Field mice mature at 6-8 weeks and elephants mature at 8-10 years! so the smaller they are the faster they mature!