This essay discusses the effects of Covid-19 on child development and mental health, specifically focusing on Ava, a four-year-old child. It explains how a registered nurse can assess Ava's mental health using psychological evaluation and incorporate Person and Family Centred Care (PFCC) theory during immunisation series of care. The essay also provides strategies for Ava's mother to aid Ava and information on relevant professional aid services accessible for Ava and her family.