part of part of immediately preceded by life cycle stage nursing stage (0-11 months) infant stage infantile stage UBERON:0034920 under-1-year-old stage HsapDv:0000261 We consider that this pediatric stage refers to an infant who is over 28 days and under 12 months old, to follow HPO (Human Phenotype Ontology) which considers infant as between 28 days to one year of life, based on the ethymology of the word (infant), meaning not speaking, see HP:0003593 (Infantile onset) and see Peter Robinson's comment [[HPO:probinson] at https://github.com/obophenotype/human-phenotype-ontology/issues/5119#issuecomment-578882539. Immature stage that refers to an infant who is over 28 days and is under 12 months old. HP:0003593 newborn stage (0-28 days)