Understanding Infant Development: What Milestones to Expect and What to Dismiss

The developmental milestone that does not occur as an infant learns to thrive in the outside world is: **Brain develops to 100% capacity** While an infant's brain undergoes rapid development and reaches a significant level of growth in the early years, it does not develop to 100% capacity during infancy. Brain development continues into adolescence and early adulthood. The other milestones, such as forming important social and emotional bonds, showing signs of learning language, and experiencing rapid physical growth, do occur during infancy.