English: Approximate outline of development periods in postnatal human development until what generally is regarded as adulthood.

There are no universally unanimous definitions, so they vary considerably, but generally fall within the faded intervals at the flanks of the periods. Definitions included in this diagram are taken from the articles for each period, and references, when present, are also found there.

For links to the periods in English Wikipedia, see talk page and en:Template:Humandevelopment