• 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.

See also

• Delayed puberty
• Mental retardation
• Delayed milestone

External links

• CDC's "Learn the Signs. Act Early.” campaign - Information for parents on early childhood development and developmental disabilities
• UMich
• NIH
• March of Dimes