“It must be noted that there is another prerequisite for the children’s independent movement and play from their earliest age. They must never be or placed in a situation in which they are unable to get out and leave independently, nor may they be fixed in a device (baby chair, baby rocking chair, standee chair, etc.), because that makes them incapacitated, dependent and helpless without the help of an adult.
Experience shows that if children are happy, active and have enough room to practice various movements they feel like practicing, and if they are provided with toys they are interested in, they do not need assistance from an adult to learn to change their situation and position: They can turn around, crawl, climb, sit up, stand up and walk.” –Dr. Emmi Pikler
This text was part of the last lecture she gave in 1984 before her passing.