Lovebird chick ignored by parents...why?

Question
My sister has a pair of breeding lovebirds.  She has noticed that when a chick doesn't make it, for whatever reason, it has blood on tips of its toes, and tips of wings...they are born that way.  Being a wild bird rescuer/rehabber, I finally convinced her for me to try to hand rear the most recent baby.  It was two days old when she told me about him.  I came to check on him, and noticed that he was very cold and not cared for by the parents at all.  So, as I would with the wild bird babies, I warmed him up, gently hydrated him, knowing he still was surviving on the yolk.  At three days old, he bobbed his head tiny head and ate a very tiny bit of thinned Exact Handfeeding formula...this stuff is good.  The last lovebird baby, from a previous clutch that I raised, is thriving.  However, the one mentioned above was much younger, and died shortly...living another day.  That next evening the second egg hatched with a healthy baby, with no blood on its limbs, and being cared for by its parents.  So, what causes the tips of their limbs to bleed, dry up, and be shunned from the parents?  Could it be a deficiency of some kind?  Any help would be appreciated.  Thank you ahead of time.  

Answer
Hi, Missey.

The babies likely aren't being born this way; the parents are probably guilty.  Usually when parents don't care for their babies, this means something is wrong with the babies (the parents know when something is wrong with their offspring long before we do).  If parent birds know their baby(ies) aren't going to survive, they neglect them, often times putting them out of their misery.  The bloody toes/wings could also be the parents picking on them for some reason or perhaps the parents even think they are grooming the babies.  I had a pair of budgies one time that chewed the wings off all their offspring.  The babies survived, they just didn't have wings.  Sometimes if parents help a baby out of the egg shell, they accidently cause damage to the hatchling.  If a baby had trouble coming out of the shell, this could be what caused this.  Sometimes if parent birds are too young, things like this happen or if they feel their offspring are in some type of danger.  I'd say if these birds are caring for some babies and not others, then something is wrong with the babies upon hatching.  

The best thing to do in this type situation is closely watch any babies that hatch from this pair, and at first sign of something amiss, pull the babies from the parents for handfeeding immediately OR don't allow this pair to breed.  Babies hatching out with some type of health problem could be due to health of the parents (poor diet, etc.), age of parents, contamination through egg resulting in developmental problems, etc., etc.  This could be a one-time occurrence or could happen with each clutch of hatchlings.

Chrys