We just got two baby chicks from my little brothers school and I have no clue how old they are so I was wondering if anybody knew a site that told the stage of how old they are.
I think your there already!
If you can post a picture, I can guarantee that someone on here has the breed and can give you an estimate on the age.
If you can't post a picture just describe it as best you can. Please include leg colour, number of toes, feathers on legs (or bare legs) and any other details.
Of course it maybe easier just to ask the teacher who hatched them.