A good kids swimsuit should stay secure while still allowing free movement through the shoulders, hips and legs. Start with the child's measurements where possible rather than relying on age alone.
For one-piece or romper styles, height and torso length are especially useful. Check that the suit does not pull at the shoulders and that leg openings are snug without digging in.
If your child is between sizes, send Kids Swimwear Gh the product name plus measurements on WhatsApp and ask for fit guidance before ordering.