Glad to help.

I don't know where you're based, but Greek-made Majorca Sub Dolphin natural rubber fins are recommended here in Europe for younger children, not least because they come in a full baby-to-adult size range and have soft, comfortable foot pockets and supple blades:

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They are reasonably priced, therefore cheaper to replace when feet grow, and they conform to German Standard DIN 7876.

Majorca Sub Dolphins are just one example of what is on offer, though. Whatever type of fins you eventually choose, be sure to check that they fit properly both in terms of length and breadth. You may be able to get some local advice from a swimming teacher as fins are often used nowadays when training swimmers.