Family sought: Police are seeking the relatives of this baby boy found abandoned in a Tsuen Wan residential building October 29.

Police are seeking the relatives of a baby boy found abandoned on the staircase of a residential building on Sha Tsui Road, Tsuen Wan, about 4.50pm October 29.

Less than 21 days old and 53 centimetres in height, the baby was wearing a blue jacket and was wrapped in a pink blanket when found. A plastic bag with some baby clothes, nappies and feeding bottles was beside him.

Police urge the baby's relatives or anyone who has information on him to contact them on 2417 5265.