I know there will be plenty of comments against CIO, but I’m looking for input on those who have tried. Advice? Tips? How long did it take? After consulting with our doctor he told us at 5 months we could start. Tonight was night 5 and the worst yet. We eventually had to give in. Everyone said it gets better after night 2 or 3, not here! Guess we just have a strong willed baby 😖