My best quess is that you most likely had issues with humidity at hatch. Shrink wrapped chicks. At any rate..the blood spot is where it was attached to the yolk..perhaps it had not finished absorbing everything b4 you helped them hatch. The chicks are most likely stressed due to the trauma of the hatch. I would leave them completely alone for 24 hrs to rest. A chick can go 2 days without food ..let them rest! Just keep them warm. After a good 24 hrs of rest, if they are more active and looking around, offer a few drops if water w nutri drench to thier beaks.best thing at this point is rest...helping chicks to hatch is very stressful on them. Don't handle them. Sometimes, due to being in the egg, some are a bit curled up at 1st. If it stays on its back to long , gently roll it back to its stomach. Best thing is rest to recover and warmth.