its tough. At the beginning you want him to trust you and form an attachment so holding and cuddling more is needed and expected. however as time passes he needs to learn to trust himself and learn to self sooth while knowing you are still close by. I had this trouble with a DCB earlier in the year with sleeping, he wouldn't nap without me holding him but by 3 months i was so over that and with the help of this site i just put him in the playpen and let him cry it out and he caught on quickly! just stay strong and if you can deal with the crying let him cry while verbally acknowledging him every once and a while. also keep communication open with the parents and see what he is like at home.