When my LO was this age I had the same problem. We actually needed to get him sleeping longer first so that he could go longer between feeds. If he was awake, he wanted to eat IYKWIM? At the beginning to get him to sleep longer I had to AP his naps. As his naps got longer, he was able to go longer between feeds.
Are you only nursing on one side? If you are, try offering the second side and see what happens. You could also offer a paci between meals and see if that stretches things out a bit.
My LO was also born fairly small and he had a lot of catching up do to, so he was/is a hungry baby
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I've had a hard time getting him on an appropriate length easy for his age because he's just so hungry. I wonder if this is the same for your LO?