Developmental milestones

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Developmental milestones are tasks most children learn, or physical developments, that commonly appear in certain age ranges. For example:

Ability to lift and control the orientation of the head (Neck control) is attained at about 3 months
Crawling begins at about 7 months
Walking unsupported is attained at about 12 months
Speech begins
Voice lowers in pitch (especially noticeable in boys)
Pubic hair appears
Genitals and reproductive organs mature
Menses begin (females)
Body hair and facial hair appears

"Normal" age ranges for many milestones are broad (a factor of 1.5 - 2 from bottom to top is possible). For this and other reasons, a single delayed milestone, especially task-related, is rarely in itself a basis for diagnosing a problem.

Note: the Tanner stages can be used to approximately judge a child's age based on physical development.

Note: the age ranges and the developmental milestones are based loosely on majority growth, implications of the majority can provide a wide variance to actual age.