It may vary some, based on who you talk to, but a good rule of thumb is:
infant: Birth to 1 yr.
Child: 1 - 12 yrs.
Adult: 12+ yrs.
In terms of providing first aid to an ''adult'', it is usually made on a subjective judgment of the casualty's size rather than age. A child is usually classed as up until puberty and an adult may be classed as after that. For example in CPR, 'child' CPR should be followed for children up until age 12 (approx) but 'adult' CPR can safely be administered to casualties above this age. It is usually made on judgment and there is no definite age limit.
Life starts at reprouduction, birth, infant, child, adult, old age, then death (OR THE END).
Infant is a child from birth to age one year.
18
For CPR an infant is birth to 1; child is 1 to 12; and an adult is over 12 years old. For the use of an AED, a child is defined as 1 to 8 or less than 55 pounds.
An infant is a child whose age is 1 year or less. Thiis is the medical definition A baby is a young child or infant who is yet unable to walk(Oxford English Dictionary)
By what age is a child's personality formed? Quote reference source.
infant mortality
infant 0 - 3 months baby 3 - 12 months toddler 1 - 3 years child 3 - 11 years in my opinion... What I learnt was, Child-age 5 to 12 years, infant-three months to one year.
If the child is flying on a Youth, Child, or Infant fare, you must provide a valid picture ID proving age or a birth certificate. If the child is flying on standard adult fare, no identification is required.
You are not legally an adult until the age of 18.
Newborn, Infant, Toddler, Preschooler, Adolecent, young Adult, Adult and old age