Weaning a prem baby

Laura • Hey I`m laura 19 recently had my baby boy :) been with my fiancé a short time and love him millions !
Hi so my little boy is almost 13 weeks old only 1 week old corrected age . He's on nutriprem 2 and taking 90mls every 3 to 4 hours he won't take any more however he is still hungry after a feed. He's starting to get teeth and is bring his hands to his mouth and kind of like chewing on his dummy or hands . When can I start trying him on puree and stuff?