I went through this recentlt too and was tempted to terminate care, but I really like this baby's parents and they were trying so hard, so I kept at it. In total, it took 4 full-time weeks to get him adjusted, but the first two weeks were the worst. The ladies on here gave me some great advice, so I will pay it forward nowWhat worked for me was to sit with him and watch the other kids play first...then I moved to sitting with him on my lap on the floor (he cried at first, then settled)...then gradually, I moved him off my lap and put him beside me on the floor...every time he tried to crawl back onto my lap, I put him back on the floor calmly and gave him a toy. Finally he got comfortable with that and eventually I was able to move a small distance away and then finally I was able to get up and move around. I did not go and pick him up when he cried...I would just tell him he was okay and go about my normal routine (as much as possible with a screaming baby). Within 3 weeks he was barely crying. After 4 he stopped altogether and he is such a sweet, happy little guy now
Good luck!