Dear Julie, Two comments. I have not heard anything about bethamethasone inhibiting milk supply, but there was an anecdotal report in JHL about a mom whose milk didn't come in for ten days and then came in like gang busters after prolonged treatment with Mag Sulfate which you had mentioned this mom was on. Second, I disagree with Helen about M:ichael Woolrich's research. He says that at least in SOME women, inadequate stimulation of the breasts during early breastfeeding may limit their maximum supply even if the situation is redressed later with improved suck/latch and extra pumping. But he does not say this is true in all women. He specifically remarks that the first six weeks seem to be the critical period. I don't think you mom and baby were past that yet, so I would still be somewhat hopeful that things could turn around. Cindy Neary RN