Child development stages

Child development stages are the theoretical milestones of child development, some of which are asserted in nativist theories. This article discusses the most widely accepted developmental stages in children. There exists a wide variation in terms of what is considered "normal," caused by variation in genetic, cognitive, physical, family, cultural, nutritional, educational, and environmental factors. Many children reach some or most of these milestones at different times from the norm.
Holistic development sees the child in the round, as a whole person - physically, emotionally, intellectually, socially, morally, culturally and spiritually. Learning about child development involves studying patterns of growth and development, from which guidelines for 'normal' development are construed. Developmental norms are sometimes called milestones - they define the recognised pattern of development that children are expected to follow. Each child develops in a unique way; however, using norms helps in understanding these general patterns of development while recognising the wide variation between individuals. This page focuses mostly on linguistic development.
One way to identify pervasive developmental disorders is if infants fail to meet the development milestones in time or at all.
Milestones by age.
1–4 months.
Physical 
Motor development
4–8 months.
Physical
Motor development
8–12 months.
Physical
Motor development
Toddler (12–24 months).
Physical
Motor development
Cognitive development
 English language
Social
Walking development 
Two-year-old.
Physical
Motor development
Cognitive
 English language
Social and emotional
Three-year-old.
Physical
Motor development
Cognitive development
Four-year-old.
Physical development
Motor development
Cognitive
 English language
Social development
Five-year-old.
Physical
Motor development
Cognitive
English language development
Social development
Six-year-old.
Physical
Motor development
English language
Social and emotional
Seven-year-old.
Motor development
Writing grips
English language
Social and emotional
Eight-year-old.
Motor development
English skills
Social and emotional
Nine-year-old.
Motor skills
English skills
Social skills
Ten-year-old.
Motor skills
English skills
Social skills
Eleven-year-old.
Motor skills
English skills
Social and emotional development
Twelve-year-old.
Motor skills
English skills
Social skills