As long as your child is happy alll day long then there is really no need to worry. And as far as the crying I have found that this too shall pass
It is very normal for kids to regress and begin going through the seperation anxiety thing once again after being oK for a while. While it is good for you to stay for a while it is not a good idea to linger for too long. It gives the child the impression that you must have a concern about leaving him also.
And do not feel too guilty that a caregiver must take him from you when he is upset. At our center we have a policy that a child should never go from a mom's arms to a cold floor, they should go into another pair of loving arms.
God Bless
Judilyn