Merino Sleeping range keeps baby warm without the risk of overheating Bambino Merino's 100% pure merino and cotton range of clothing includes sleep suits, body suits and pyjamas as well as a luxurious one-size sleeping bag. Produced entirely from natural fibres with no synthetic fillings or linings, the products are designed to keep baby warm without the risk of overheating. Natural merino is breathable and has the amazing ability to trap and release warm air as required to maintain an even temperature throughout the night.