I liked good night sleep tight and the baby whisperer. For Sarah I used the baby whisperer and the healthy sleep habits happy child. None of them worked for Hailey, but both worked well for Sarah. I threw out my healthy sleep habits happy child after Hailey was born, when I read that the author doesn’t believe in reflux causing pain or sleep problems, nor did he believe in MSPI.
Hope things work out well for you all.