Holly, I'm lead to believe that the 'old-style' SNS capsules are rated 'safest'. That's what we used for DS (but a new and updated version ), and like Olive, we loved it! Will be doing the same this time around too. We moved on to a Meridian for DS, which he is still in, and have been very happy with that too . Before long though he will be in a Maxi-Rider.