Jessica Hamzelou in New Scientist:
A 30-year-old transgender woman has become the first officially recorded to breastfeed her baby. An experimental three-and-a-half-month treatment regimen, which included hormones, a nausea drug and breast stimulation, enabled the woman to produce 227 grams of milk a day.
“This is a very big deal,” says Joshua Safer of Boston Medical Center, who was not involved with the treatment. “Many transgender women are looking to have as many of the experiences of non-transgender women as they can, so I can see this will be extremely popular.”
The transgender woman had been receiving feminising hormonal treatments for several years before she started the lactation treatment. These included spironolactone, which is thought to block the effects of testosterone, and progesterone and a type of oestrogen.
This regimen enabled her to develop breasts that looked fully grown, according to a medical scale that assesses breast development based on appearance. She had not had any breast augmentation surgery.