Is this chicks size normal? Potential dwarf?

[Brummie Pekin]

I bought 4 chicks around 3 weeks ago and they were all 2 - 2.5 weeks old. They were all about the same size except one which was slightly smaller however over the last three weeks the others are almost double its size and it has only grown a little from when we first bought it. It is around 2 inches (10 Centimetres) tall (without its neck stretched). From what I can see it is eating and drinking fine (and it loves to eat worms) it should be approx 5 weeks old but it doesn't look it. I have read somewhere that it could be a dwarf chicken. could it? I am worried that if it is a female it wont be able to lay healthy eggs. Any help would be greatly appreciated.

As you can see in the pictures it is a lot smaller than the other chicks. (It is a Pekin)

 

[Ellaoreospice]

One of my hens was like this but she soon hit a growth spurt. Maybe your chick is a different mix of chicken. My small one was a turken and she was like half the size of the other one but then she grew

 

[Brummie Pekin]

One of my hens was like this but she soon hit a growth spurt. Maybe your chick is a different mix of chicken. My small one was a turken and she was like half the size of the other one but then she grew

I'm hoping that's how it turns out, Thanks for the feedback

 

[Ellaoreospice]

No

I'm hoping that's how it turns out, Thanks for the feedback

no problem I hope everything works out, if she is a dwarf she will be healthy by the looks of things