Best way to introduce my new rats to my current rats?

[spider pig!!!1]

I just bought 4 4 week old male rats. So adorable. I had one of the new rats on my bed, and tamaki was on the bed. He sniffed the baby, then walked off. The bed isnt nuetral territory. I know you should keep them apart for a few weeks before you start introducing them, but i think the sooner they are introduced the better
I had them in the bath tub, and they were fine. No aggression from the big ones. The black baby and the rex one squeaked a bit when they had their bum sniffed, but they werent being hurt. Most of the time they were all bruxing

 

[Muffy Wings]

Okay! Sounds like you got this pretty good! So I think you should have them spend more time together, say, by ... having them play games together maybe?

 

[Norma Jeane Mortenson]

I think you should keep them separate but maybe once everyday you should take them all out and let them play. If they seem to be getting along then you could keep them together. If you notice the adult attaching the smaller one, I would wait at least until he gets bigger.