The bigger in the first picture looks good. About the same size of my 1 month old plants( I'm growing a slow veg strain and I stunted them a bit by overwatering). Experiened growers 1 month olds are bigger then both ours. The other two you got aren't looking so good. Not sure what is wrong with them, would need more info, temp and feeding and all that. Seedlings look good. Is that CFL(s) light? If so I would pretty much keep them as close as possible to the 1 months cuz the light isn't that "intense" from those bulbs. Raising an HID light such as HPS can make internodes stretch as you said. But I've never heard or read someone recommend the same with CFLs and wouldn't as I said. I'm new to this too and figuring it all out. Good luck to us both