In theory if your youngster is well grown and healthy, I'd give it a go. Remember quarantine issues, blah, blah...
I usually:
Introduce on neutral territory so they aren't forced immediately "into each others face."
Provide as big a pen as possible.
If an existing pen, wash and change bedding.
Provide two water and feed bowls.
Place loads of hay in pen for them to burrow under.
Scatter fresh greens to distract them when you put them back in pen.
Provide hidey holes ie boxes, cabins, igloos so they can each have their own bed if they want it.
Keep away from sows.
Some people bath, dab with heaven knows what, I never have so can't advocate this :
Observe carefully, if serious fighting ie broken skin, straight out.
In my experience, they either will..or won't get on...simple as :-\
I'm sure other people will have their own thoughts!
Barbara
*The only reason I would bath a male is if he had been in with a female, though this should hopefully rarely be the case.
If your 5 month male has been bred from be especially careful as he may be especially frisky with the baby