Dr Lee will answer in this thread when he gets the message. You can "talk" directly to him.
5.5 months is a sweet age. So full of mischief. I have 6 that just turned 6 months today.
They will be going in to get fixed as soon as I can get a Sunday off and schedule their s/n. Then they go up for adoption. They are a very busy bunch.
Hang in there. I know how we worry about our babies.