Early childhood is a stage in
human development. It generally includes
toddlerhood and some time afterwards.
Play age is an unspecific designation approximately within the scope of early childhood. Some age-related development periods and examples of defined intervals are:
newborn (ages 0–5 weeks);
infant (ages 5 weeks – 1 year);
toddler (ages 1–3 years);
preschooler (ages 3–5 years); school-aged child (ages 5–12 years);
adolescent (ages 13–19).