Sainsbury's and Müller have recalled children's yoghurts over fears they could be contaminated with pieces of plastic. Sainsbury's has recalled a batch of its own-brand Strawberry Fromage Frais pouches after it was discovered it may contain pieces of blue plastic - a possible choking hazard. And Muller Kids Corner Butterflies Strawberry yoghurt four-pack has also been recalled over fears it may also contain a small piece of plastic. Both the product recalls were issued by the Food Standards Agency. Sainsbury's said the recall was a "precautionary measure" and that anyone who has bought the 4x90g packs should return them to the store where they were bought for a full refund. The firm said it affected packs with a use by date of May 7. The 90g pouches are sold in packs of four. A statement from Sainsbury's said: "As a precautionary measure, we are asking all customers who have bought this product to return them to their nearest Sainsbury's store, where they will receive a full refund.