A trustee for a breastfeeding charity has quit after the charity introduced an inclusivity policy allowing trans women to attend their support groups.

Miriam Main quit yesterday and in her resignation note she spoke of “bullying, lies, and cruelty of recent times” and expressed that this had been very hard to endure.

She added that she refused to help biological men “perform a poor imitation of breastfeeding,” potentially risking babies’ safety.

“I hope that the wonderful work of hundreds of women is not lost through mixing causes and politics,” she said.

Main’s departure comes only a few days after founder Marian Tompson also stepped down.

Tompson, who founded La Leche League in 1956, said the organisation had become a “travesty”.

She expressed her anger at the charity accepting men “who, for whatever reason, want to have the experience of breastfeeding”.

“This shift from following the norms of nature, which is the core of mothering through breastfeeding, to indulging the fantasies of adults, is destroying our organisation,” she said in a letter to the leaders of the charity.

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Directors at the British arm of the charity have already requested that the Charity Comission intervene over this inclusivity policy, after a minority of its board members sought to implement it.

Meanwhile, the LLLGB produced documents referring to non-binary and transgender people stating it “supports everyone who wants to breastfeed or chestfeed in reaching their goals”.

It added: “We do not discriminate based on sex, gender or gender identity.”

Helen Joyce, the director of Sex Matters, a gender-critical campaign group, said LLL was “destroying its founding mission”.

She said: “The situation at La Leche League is one of the starkest examples of how gender-identity ideology turns organisations upside-down.”

“By including men who want to breastfeed in its services, LLL is destroying its founding mission to support breastfeeding mothers.”