The post on Facebook detailed how the mum, a relative of the post's author, was 'publicly embarrassed' for 'quietly breastfeeding the baby under a blanket'.
She said: "I am so sad, angry and disgusted to hear that my beautiful family member and friend was asked to leave a coffee shop in Leeds Trinity last week - why? For quietly breastfeeding her four week old baby in the corner, under a blanket (despite the fact that there was no feeding chair in the toilet, and her baby was hungry).
"So many new mothers have been put in this position and publicly embarrassed and forced into having to sit on dirty toilets feeding their newborns.
"Why do some people believe the act of feeding a child is something obscene instead of something necessary?
"Apart from anything, women who breastfeed in public in the UK are protected from discrimination by the Equality Act, passed in 2010."
The editor of The Yorkshire Post, James Mitchinson, has offered to personally send a bouquet of flowers to the affected mum. Do you know who she is? Share this post and help find her.
Have you had a bad experience breastfeeding in public, or do you know someone who has? Tweet us @leedsnews or @yorkshirepost