Olaf can reason consistently about real and tangible things. However, he cannot yet reason about abstract ideas or situations. There are six stages. It emphasizes both psychological and social aspects of development. The first stage is called oral.
Autonomy occurs when young adults leave home.
Mario's wife has just given birth to a normal, healthy baby. Kathleen reads books aloud to her developing fetus. In North America, Western Europe, Japan, or Australia, the chance of an infant dying in the first year of life is less than 1 in 100. The head usually accounts for about 25 percent of a newborn baby's total length. A baby kicks its legs, smiles, and kicks its legs again.