sleep question

Hi. I have a question. Have any of you experienced this before with your little ones. So we started sleep training my little girl st one point was not sleeping through the night unless she was in my arms. My husband and I were so sleep deprived we were going nuts. We brought her to the doctor who checked over her and have her a clean bill of health and talked to me about letting her cry it out. I was uncomfortable with the idea because I thought maybe this was hurting my baby feelings- silly I know. As a last effort we tired it and so far day two it's working out quite well.