Cheeky - most pockets come with inserts - although they are microfibre - they sell the bamboo or hemp inserts separately (eg, I'm talking about BumG's, Happy Heiny's, Haute etc)

Green Kids sell all their inserts separately.

Might still fit into mediums you know - DS is still in medium IB's (they actually fit him better than the larges do) and he's 12.5kg.

And welcome Kellie