development
16 questions tagged development — spanning every one of the seven Ws.
Why do we have baby teeth?
A child’s jaw is too small for adult-sized teeth, so baby teeth act as smaller placeholders that guide the permanent teeth into the right position as the jaw grows.
Why do human babies have soft spots on their heads?
Babies have fontanelles so the skull can flex during birth and still leave room for rapid brain growth in infancy.
Why do babies learn language so quickly in the first few years?
Early childhood is a period of high brain plasticity, so the brain is especially ready to detect speech sounds, patterns, and meaning. Exposure and social interaction help wire language networks rapidly.
When was the marshmallow test first conducted?
The best-known marshmallow test studies began in the late 1960s, with Walter Mischel’s work at Stanford starting around 1968.
When was the first attachment theory published?
John Bowlby’s first major attachment theory work appeared in the 1950s, with key papers published in 1951 and later.
When was the first recognized case of autism spectrum disorder described?
The first widely recognized clinical descriptions of autism were published in 1943 by Leo Kanner.
Where are the Wolffian ducts located during early development?
The Wolffian ducts are embryonic ducts found in the developing reproductive system. In male development, they contribute to internal reproductive structures.
How do hormones control puberty?
Puberty begins when the brain and endocrine glands start releasing hormones that trigger physical changes like growth, body hair, and reproductive maturity. The process usually begins between ages 8 and 13 in girls and 9 and 14 in boys.
How does the adolescent brain change during puberty?
During adolescence, the brain prunes unused connections and strengthens important ones. The prefrontal cortex matures later than emotion and reward systems, which helps explain teenage risk-taking.
Why do some babies have blue eyes that later change color?
Baby eyes can look blue because they have little melanin at birth. As pigment develops in the iris during the first months or years, the eye color may become greener, hazel, or brown.
Why do some children develop more slowly or faster than others during puberty?
Puberty timing depends on hormones, body fat, genetics, health, and environment. The brain’s hypothalamus and pituitary glands start the hormonal cascade that drives sexual development.
Why do children’s brains learn languages faster than adult brains?
Children’s brains are more flexible and spend more time absorbing patterns from the environment. Early language learning is helped by high neuroplasticity and heavy exposure.
What is metamorphosis in amphibians?
Metamorphosis is the dramatic body change some amphibians go through, such as a tadpole becoming an adult frog.
What is paedomorphosis in amphibians?
Paedomorphosis is when an adult amphibian keeps juvenile features, such as gills, instead of fully changing into the usual adult form.
Whose work described the ‘attachment theory’ in infant psychology?
John Bowlby’s. He argued that early caregiver bonds are crucial for emotional development.
How does the body know to make different organs in an embryo?
Embryonic cells receive chemical signals and turn on different genes depending on their position. These instructions guide them into organs and tissues.