You’d have to really, really want to carry your own kid to risk the side effects of anti rejection drugs!
Beyond the obvious increased vulnerability to viral and bacterial infections (prophylactic antibiotics, antivirals and antifungals can be prescribed) there is also a well-documented elevated post-transplant cancer and cardiovascular risk.
And, perhaps of particular interest to those taking hormones/having surgeries to ‘feminise’ one’s appearance, other side effects include:
Cushingoid facial oedema (moonface)
Hypertrichosis (abnormal hair growth everywhere, like the Victorian side show exhibits)
Gingival Hyperplasia (gums that overgrow your teeth)
Truncal obesity (and other weight gain)
Striae (extreme stretch marks)
Acne
Muscle weakness
Osteoporosis
Mood swings/depression
If the pay off is not dying due to organ failure, these are considered to be distressing but acceptable conditions but factor in the risk of birth defects/miscarriage/premature labour and the fact that infertility is not in itself life threatening, and I really cannot see how this is considered ethical for women, let alone men.
The NHS sometimes struggles to find enough critical care beds to cater for those on the current organ transplant list (although considering a young transman has already publicly stated that mastectomy for trans patients is just as important as mastectomy for those with breast cancer, I doubt such practicalities will enter the minds of enthusiastic would be womb-recipients).
www.bbc.co.uk/news/health-47668136