A depressed nail in the centre with the periphery curled upwards is a sign of a rebound nail.
If the haemoglobin is normal and there are no other abnormal symptoms, it usually disappears with the growth of the newborn after balanced nutrition and there is no need to worry.
If the ingrown nail persists for a long time and the child has dull hair, irritability, inattention and susceptibility to infection, one should be alert to iron deficiency anaemia, calcium deficiency or other underlying conditions related to the condition and needs to be seen as soon as possible.