Lung development begins in the womb and continues until about 8 years of age. The process involves the formation of [alveoli](href), the tiny air sacs where gas exchange occurs. At birth, a baby has around 20-50 million alveoli, but this number increases to about 300 million by the age of 8. Environmental factors, such as exposure to pollutants and secondhand smoke, can adversely affect lung development. Ensuring a clean and healthy living environment is vital for optimal lung growth.
