If he is crying a lot and it is determined he is not sick, he could just be scared. Some cats adapt to new environments immediately; others take a while.* I would just pet him. Once he knows he is safe, he will probably calm down.
*Example: About 25 years ago we moved. The cat we had at the time cried (continually) in the new house for THREE days (almost drove me batty). Once she knew it was now her new home, and that we weren't leaving her, she calmed down.
Last edited by munchkin; 05-07-2013 at 02:06 PM.