Instruct: Classify Amazon reviews into positive or negative sentiment
Query: this book is upsetting

Perhaps if your baby is naturally very calm and a good sleeper then following the recommendations in this book will probably do minimal damage to his/her development. However, for a baby who has a tendency to be more fussy and craves comfort following the advice in this book seems absolutely cruel. It has been well-established that this "infant management system" can lead to dehydration and stunted growth but that would really be the smaller of my worries. Some babies need to be held and need to be soothed and need to be fed at a time they may not be convenient to their parents. To allow these babies to simply cry in their cribs and go hungry is emotional abuse.