part of part of life cycle stage nursing stage (0-11 months) HsapDv:0000260 The definition of an age for human weaning is difficult to define due to individual and cultural variations. The natural age of weaning in humans could be 2.5 years, with maximum 7.0 years (see https://www.health-e-learning.com/articles/A_Natural_Age_of_Weaning.pdf), but we decide to stop this period at 1 year-old, before usually language acquisition. UBERON:0018685 Human developmental stage that covers the first period from birth, with breast feeding and/or bottled substitute, and that stops at language acquisition. under 1 year old pediatric stage