The incident took place at a pub on St Mary’s Row in Moseley shortly before 4pm on February 23.
West Midlands Police has issued a photo of a man officers want to speak to following the assault, and asked those who recognise him to get in touch.
Do you recognise this man? Photo: West Midlands Police
A force spokesperson said: “If you recognise him call us on 101 quoting crime number 20/156558/25.
“Alternatively, call Crimestoppers anonymously on 0800 555111.”