Most SSC can be used for a long time and will get you through the toddler years, unless you have a very large child or plan to wear after 35lbs. An Action Baby Carrier is included in that and I know several people that use them with their toddlers.
That being said, there are some designed specifically for toddlers that will go beyond 35lbs. Plus, a toddler carrier is usually wider, taller, and is more supportive for heavier kids. The Boba and Oh Snap are two well known, easy to find toddler carriers, but there are a lot more out there. Both of these can be used as early as 6 months, but you may find the carriers to be overwhelming on a 6 month old, especially if you have a smaller baby. So you may or may not be able to use it with your next baby at 6 months. If you have tall, big babies, it should be less of an issue.
So whether you decide to get a toddler carrier or a standard SSC really just depends on what you are looking for. I feel like most SSC should work fine, and honestly, if you really find you NEED a toddler carrier down the raod, you can always sell your carrier to help pay for a toddler one later.
Hope that helps a little. Good luck!
Ruth, mama to 2 little monkeys and owner of Zerberts
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