Hi and welcome to YT. It sounds like he may just be adjusting. I suggest putting him on a feeding schedule if you haven't already. No food or water after 8 or 9 pm. At 7 months, he should be able to hold his bladder through the night. One thing I did for my girl, was hide little treats in her crate when she wasn't in the room and then I'd let her find them herself. Maybe try this and he will associate the crate with something good and fun.
Also, when you leave during the day, he may be having a little bit of separation anxiety. I went to Petsmart and bought this little heartbeat pillow for Harley. It's really great! It looks like a bone and has a voive box inside. When you press it lightly, it sounds like a heartbeat and it's used to sooth young puppies. It's sensitive enough that if your baby moves around or lays on it, it will begin again and beat for about 10 minutes. I never had a problem with Harley crying in her pen once I bought this.
Hope everything gets better for you and the baby. Give it time, and he'll grow out of it
