I like bantams. They tend to be friendlier and come in many colors that are not in standard size. Of course the same is true about standard chickens though they have less colors that don't show up in bantams. Standard...
Don't feel bad, you haven't failed your chicken, you're doing everything you can. Some people would kill a sick chicken to stop the sickness from spreading.
Both pullets. No hackle or saddle development is showing. They both do not have pointed tail feathers. If they were cockerels they would have all of the above. Except in sebright bantams of course.
I had a bobcat that got a chicken during the day once. I remember someone bought chickens from me and when I went out 30 minutes later I found a wing on the ground. In broad daylight. Pulled it right through the fence.
Wow such nice chickens. I'm glad that they hatched successfully. I remember when had sitting hens as soon as the chicks started to hatch or hatch out the ants came. I lost 4 that way before using the incubator to hatch...