Annaprashan is a first meal that provide to new born child. that give vedic education to life as Sanatan Dharma says. It is basically gives a transition way of life between the present life style to the vedic so that society easily move towards vedic without any stress.

Ashram is a staying period in life that represent what you should do or are capable of doing. It is basically the way of life of Sanatan Dharam. They have included Ashram from birth to death and are divided each period of almost 25 years into 4 parts, assuming life will be 100 years, and these are Brahmachary, Grihasth, Sanyas, and Vanprasth.