hen we bought Lilly home she weighed less than our guineapig and I used to worry all the time. I spoke to the instructor at our puppy class and she advised as long as there is no crying/yelping or blood leave them to it and just keep an eye on them.
We have never had any of these things happen and 3 months on they still play rough and tumble.
I do interrupt their play frequently (with treats or toys) just to get their attention back onto me then release them to play again so they listen out on walks etc

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.