1. Prenatal stage, A. The period when a person reaches physical maturity and represents the longest part of life., 2. Infancy, B. The stage of development that happens before a baby is born., 3. Toddler, C. The final stage in a person's life cycle., 4. Puberty / Adolescence, D. A child's first year of life outside the womb., 5. Adulthood, E. The teenage years and transitional period marked by major growth and reproductive changes., 6. Old age, F. A young child who is just learning or has recently learned to walk (usually 1–3 years old).

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