I've found the ones that aren't going to make it do a lot of peeping with their eyes closed. Hopefully your little one will perk up. I had one I was worried about recently but it did improve and it's about a month old now. Sometimes they take a few days to recover, then they are right as rain. :fl
You do get the odd one that just doesn't seem to recover from hatching. In our house they are usually the ones the kids have declared to be their favourite! You've done nothing wrong, it isn't sick, it just isn't thriving. Here in NZ (hi neighbour) we can get Nettex Poultry Nutri Drops but I...