Need help with my 3 weeks old chick

[TyKay]

Hi! I'm new from New Brunswick, Canada. We just got are first batch of chicks 2 weeks ago. My chicks are 3 weeks old today. For a few days now, I have one that doesn't seem to be able to stand up for a long period. It eats, drinks, poops, scratches around like they others. But it won't stay up too long. It will even lay on it's stomach to eat and scratch in the wood shavings. It's bright eyed, nothing seems to be wrong with it except the laying around. It's the smallest of all the chicks. It's legs are straight. They other ones don't pick on it etheir. Can you help me? Thanks in advance!!
P.S. In the second photo, it's the one on the right.

 

[Eggcessive]

I would keep watching the legs for any abnormalities every couple of days, but I would put chick vitamins in the water. Some products such as Poultry Cell also contain trace minerals which can be helpful. Ar you feeding a good fresh chick grower feed? Until you get the vitamins, I would crush and dissolve 1/2 human B Complex vitamin in a liter of their water daily.

 

[TyKay]

Yes, they are on organic chick starter (non medicated). I will try to add some vitamin to their water to see if it helps. Thanks!

 

[TyKay]

Does anyone know what kind it is by chance?

 

[21hens-incharge]

It looks to be a Black Australorp. I do hope the little one does start getting stronger.

Eggcessive gave good advice as usual.