Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
This book was a great read for me as a first time mother. Well researched, detailed and a great support to read nearer the end of my pregnancy. I especially liked the thoughtful prayers to help with bonding to your unborn blessing. Thank you!