0 To 1/2 year ------ Respond to sounds and words
1/2 To 1 year ------ Begin to pick up words
1 To 1 1/2 years -- Enjoy recognizing colorful pictures
1 1/2 To 2 years --- Start to turn pages
2 To 3 Years ---- Insist on lively pictures and words
3 To 4 years ------- Asking question
4 To 5 yearsS ----- Mastering sentences
