I just transitioned a baby in and almost termed them because it was 4 full weeks of nonstop crying ( thank goodness she was an amazing sleeper with two 2 hour naps a day!) but on the first day of week 5, it was like a light switch went off and she never cried again!! She was even away for a week and I thought we would have to start over, but she came right back all smiles! She's 11 months....started at 10 months. Hope is helps!