I am a nanny for a 2 1/2 year old and almost 3 month (13 pound) boys. C was a super easy baby. Slept in crib at 2.5 months. J is transferring from soft bassist like rocker to his crib which he absolutely refuses. We tried everything- rocking to sleep (put in) instant wake up, letting him cry for a few- pick me up now!! We want to try to transfer him to crib but don't want to take time away from 2.5 year old. HELP please!!