Depending on where he is, there is usually a period of Admission & Orientation which integrates the inmate into the system. They learn the rules and expectations. Once the go through this period of "education", they will be allowed to receive visitors.
https://www.inmateaid.com/ask-the-inmate/how-long-after-arrival-will-i-be-able-to-have-visitation-with-my-son#answer
Accepted Answer Date Created: May 04,2015