Is it possible to give blood transfusion {packed red blood cells} through an arterial femoral line for the neonates?

Possible, but why?: It is not commonly done to put fluids into an arterial line, that usually is used for pressure monitoring and to obtain blood for testing. Could be done on a pump in theory. Usually would use a peripheral or central venous line to transfuse. Neonates may be only accessible vessel due to small size.

Packed cells: Yes, but there is less of a problem when given through the venous route