The M&S Swim Shorts in UPF 50+ Sun Smart for 9-12 Months with a Tropical Palm Print in White are perfect for your little boy to wear by the pool or at the beach. Made from durable polyester material, these 2-piece swim bottoms feature UV protection to keep your baby safe from the sun's rays. Easy to care for with machine washable instructions, these swim trunks from Marks & Spencer are a stylish and practical choice for your bundle of joy. Includes inside pants to help support the nappy. Used but in great condition. Soft material very comfy fit. I feel these are generous in size as with most M&S items so may also suit 12-18m (my little boy wore them 2 summers). Please ask me for measurements if you would like to know before buying.