Ive read this post over and over, and this post is great. i am in school for Early Childhood Education and i just read up on this topic. Infants need all of the above, it helps them form a trust from parents and caregivers. This research shows it will aslo help the child as he/she grows in cognitive, physical and especially social development. Now i know you are wore out with a new baby, being a mom myself and you get frustrated, but i dont think you should let an infant ever cry it out after taking these classes. All children are unique and you know your baby best and it sounds like you are a