What cute babies!
Personally I would not use the dividers. Introductions should be a one time thing... you introduce, and you leave them be! If you introduce, separate, introduce and separate again... the guinea pigs will have to reestablish dominance every single time they're together again. It gets very stressful. Besides, seeing as the babies are so young, introductions should go smoothly... adult guinea pigs make very good nannies (even some boars have earned the name "nanny boar" for the young boys!), and they'll be more likely to accept a baby right in, rather than they if the "intruder" were an adult.