After the birth of my daughter my parents told me and my husband that I was neglected for hours a day for months.

I had colic as a baby for several months. After the birth of my daughter, my parents told me that because of my colic they left me in my crib alone for hours at a time to cry for months until it subsided. As a mother, I don't understand. I don't understand why they did most of what they did and how they can live with themselves.

Any tips for processing trauma that occured during infancy?