When Do Pullets Start Laying Eggs?

[Ilovefarming]

My pullets will be 16 weeks old tomorrow. They have not laid eggs yet, and their bodies are small (the full grown hens are a head taller!) and have tiny pale combs. They are clucking normally and have good shiny, feathers. Should they have grown up more by now? Should I include pics?

 

[ChickenCanoe]

Depends on the breed and time of year. 16 weeks would be extremely early for any breed, even approaching maturity in spring. Most breeds need to be at least 20 weeks. Maturing in autumn or winter more like 24+ weeks.
The small pale combs tell you that they're not sexually mature.