Walking is the crowning achievement of the baby's first year of life. When ready, babies focus their attention on the challenge of walking as though they cannot get enough. With or without help, they will stagger, topple, halt, and start forward again and again. Praise and enthusiasm from parents give them inspiration. Twelve month olds can undress themselves completely and will spontaneously become naked before naps, at night, and when in bed.
Definite food likes and dislikes appear.
Intense excitement may hinder a baby's ability to sleep. Temper tantrums may begin to emerge. New growth and developmental milestones occur by the end of 12 months. Walking when supported. Preferring crawling to walking, unless walking without help.