Supposed to be Buff Orpington

[RinaRoo]

That's a buff orp . .... she appears appropriately feathered for age, so failure to thrive isn't as likely, but bantam orps arent *that* common in retail sources and are generally sold as mixed bantams vs. by individual breed. Hatchery bo are rather small compared to sop orps, do you have other chicks the same age (of any breed) you can show her with?

Only when they were in the brooder, and she was the quickest growing then. I have pics of my EE Cockerel that's about 1 week older, but it's not next to her so won't be of any use.

 

[EggSighted4Life]

Nutrena 18% chick starter/grower. Meal worms as treats, just started free ranging.

I personally can't stand that they are allowed to label 18% protein feed as "chick starter".

Also... Orp are NOT a fast growing breed... slower than many and a main reason I didn't keep them as a primary breed for meat.

Agreed she does appear to be BO... but does sound smaller than expected according to your description.

I have seen some genetic anomalies so it doesn't surprise me coming from hatchery. My friend had the tiniest SL Cochin... he has finally caught up around a year old and is quite beastly in size.. with a super calm/slow demeanor... and has yet to crow at over a year old!

 

[Gray Farms]

@EggSighted4Life is right on the growing. Orpingtons "especially English" are very large birds. Not as much with American Orpingtons which yours is being a hatchery bird. But they are very slow growing. Especially English Orpingtons, my English Orpington roosters aren't fully grown until nearly 2 years old.

She is likely just a slow grower, no two chicks develop exactly at the same rate. You could mix 1/2 chick starter and 1/2 game bird starter if you wanted to up the protein. But its not really necessary. She seems to be healthy and growing just slower. She could very well hit a growth spurt and catch up.