I started a bit of BLW from 22wks (naughty me) when Bubs was starting to sit unaided and tried her in the high-chair but she used to flop to one side, her arm/shoulder would slide under the tray and she'd get quite annoyed about it! But would try it for a little bit every few days and within a couple of weeks she was mostly sitting for 20mins at a time and munching on food.....so i say go for it! And clementines were an inspiration - Bubs enjoyed sucking them this morning. Crumpets also devoured, but only the buttery side....funny that?!