This book captivated my babies from four months onwards! We could read it over and over and they wouldn't tire of it. When they were crying, sometimes I would just pull out the book, show them the cover, and say Moo, Baa, LaLaLa , and they would instantly stop crying. For us, it was a must-have in our daily reading schedule! The larger size format was also very captivating and we really enjoyed looking at it every day.