The sign says "祝大家圣诞快乐" (Merry Christmas)

***LATER THAT DAY***

URUMQI - Police have confirmed reports that the circumstances surrounding the disappearance of Mr S. Man (1 day old) are being regarded as suspicious, and are currently searching for the main suspect. His imaged was captured by local CCTV, and police are asking anyone with any information to contact their local police station immediately.