Breast augmentation revisions
You raise some very good points, and it all depends on what you want. If you would like the new implants, now is as good a time as any. The lifespan of implants varies, but the rupture rate of them is about 1%/year which is cumulative and the capsular contracture rate is about 13% over a lifetime. I've seen implants in for 20-30 years, so if you're doing well you may not have to revise your implants at all! However, the average is about 1-2 revisions in your lifetime. Good luck!
Why do you want a revision?
So far, you have not told me why you either need or want a revision. Are you having a problem? Also, gummy bear implants are only available for breast reconstruction, not elective augmentation. Also, they are a lot firmer. The best implants out there in my opinion are round smooth silicone.
Only do surgery when you need it .
If its tolerable to you, wait before Breast Augmentation
If you situation is tolerable to you, then by all means, you should wait until you are done having children before undergoing more breast procedures. This minimizes the chances that pregnancy could have an adverse effect on your breast appearance and eliminates the changes that accompany pregnancy. By waiting until after you are done childbearing and breast feeding, your breasts will be in a stable, relatively stationary state allowing for better plan for achieving your goals and decreasing the chances that changes will occur necessitating more revisions..
As for routine revisions, in my experience, they seem to occur at 10-15 year intervals when you are trying to maintain a "best result".
Wait until after having children
It would be best to be done having children before considering revision. This is because your breasts are likely to change after having kids, and anything you do before may be undone.
Revision timing of breast implants: before, during or after children
Clearly, the longer you can defer surgery, the less likely you will require multiple revisions in the future. IF there are no pressing needs to have surgery now, I would wait unitl comletion of childbearing and then have a procedure.
Breast augmentation revision
Something must have peaked your interest in a revision. Are you unhappy with your breasts now? If you had saline implants- do they feel or look unnatural? Are your breast drooping? If you are just "interested" in alternatives or you are just minimally displeased, go on with your life, have your babies and enjoy them and then re-visit your question. Yo may have other concerns at that time and maybe newer implants or techniques may be available. It's not that you get a tune up or revision every so many years. You must have a problem you are concerned about or a complication that justifies the revision.
Breast Augmentatio Revisio with Gummy Bear Implants
This is where the old saying fits "if it ain't broke, don't fix it." Revisions should only be done to correct an unsatisfactory appearance. Changing the implants just for the sake of changing them because the 410's interest you is no reason for surgery. Wait until either you don't like the appearance of the breasts, are having pain issues or similar or implant rupture. Especially wait until after childbirth.
Wait until you actually need surgery
If you are satisfied with the way your breasts look, I would not try to change the implants. You should at least wait until you are done having one or two more children, then decide. You are lucky that you haven't noticed much change with your first two children, but over time and after one or two more children, there will most likely be a difference.
At that time, you should carefully evaluate your situation and see if you need/want additional surgery. Don't do it now.
Thank you for your question!
If there is nothing wrong with them right now, I would not worry about revising your implants. Even though you have had minimal changes to your breasts with your first two pregnancies, it may be best to wait to avoid any possible changes that could require more surgeries. Also, with every surgery, there are risks and possible complications. Why risk that, if not absolutely necessary. It sounds like you have had good results so I see no reason so far to do anything.
If you are not having problems with the implants, then I would leave them alone. In terms of cohesive gels, they are still not available for general use in the US. If you plan to have a few more kids, then I would wait.