Breast development happens in certain stages during a woman's life: first before birth, again at puberty, and later during the childbearing years. This starts with a thickening in the chest area called the mammary ridge or milk line. By the time a baby girl is born, nipples and the beginnings of the milk-duct system have formed. The first thing to develop are lobes, or small subdivisions of breast tissue. Mammary glands develop next and consist of 15 to 24 lobes. Mammary glands are influenced by hormones activated in puberty.
Stages of Teenage Development: Physical and Psychosocial Aspects
Teens need a lot of sleep because their bodies are growing and changing quickly. These changes mean puberty. Your teen's body will become adult-like in size, shape and sound. While girls physically mature at younger ages than boys — at around age 15 for girls and 16 for boys — it's important to keep in mind that all children develop at different rates depending on heredity and other factors. For many teens, puberty and the next few years can be very difficult because their bodies are adult-like but their minds are still developing.
Adolescent Growth and Development
Physical growth pattern during teenage. Teenage development is a phase of rapid physical growth that is only second to the rate of growth seen during infancy. The rapid growth phase of adolescence lasts for years, when on an average: Girls gain 8.
The development of children ages 12 through 18 years old should include expected physical and mental milestones. During adolescence, young people go through many changes as they move into physical maturity. Early, prepubescent changes occur when the secondary sexual characteristics appear. The sudden and rapid physical changes that adolescents go through make adolescents very self-conscious. They are sensitive, and worried about their own body changes.