A feature of fetal RBC in adult –
Alkali denaturation resistant
Small in size
Has more 2,3 DPG level
More iron than adult RBC
Features of fetal RBCs

It contains less 2,3 DPG
It is alkali denaturation resistant
It is larger in size than adult RBC → Larger in volume
It contains less iron than adult RBC
Life span is less.