Emergency doctors in the UK have issued a safety warning over water beads, which could be given to children as gifts over Christmas.
The brightly coloured soft plastic beads, also known as jelly balls, sensory beads, or water crystals, are marketed as crafting tools and homeware items - but also toys.
They are typically only a few millimetres but some can expand to several times their original size in about 36 hours when exposed to liquid, creating a hidden danger. If a child swallows one, they can cause bowel obstruction and the consequences can be fatal.
The Royal College of Emergency Medicine (RCEM) advises that the beads should be kept well away from children aged under five.