infantility

adjective

1. characteristic of or befitting an infant; babyish; childish: infantile behavior.
2. of or relating to infants or infancy: infantile diseases.
3. Physical Geography. youthful(def 5).

adjective

1. like a child in action or behaviour; childishly immature; puerile
2. of, relating to, or characteristic of infants or infancy
3. in an early stage of development

adj.

1. Of or relating to infants or infancy.
2. Displaying or suggesting a lack of maturity; extremely childish.