I just had this conversation with my own midwife yesterday. I asked her about using NuvaRing as a stop-ap until my husband has his vasectomy-- we just went through a fourth pregnancy loss (we have five healthy kids and don't plan to have more--want to make sure we don't get pregnant again before the vasectomy 'takes.') and don't want to ever go through one again, so I'm feeling desperate to avoid pregnancy at this point. My midwife pointed out to me that I'm still breastfeeding my 18 month old, and that any form of hormonal birth control will put horomones into my breastmilk. While my baby does nurse much less than he used to, of course, he still is nursing and still gets maybe 1/3 of his nutrients from breastmilk. She asked me if I would ever go into a grocery store and purchase milk for my baby that had a warning on it that it contained human hormones like estrogen in it. I said 'of course not,' and that, in fact, I only feed my kids organic milk because I don't want them to have Bovine Growth hormones in their bodies. So she made her point well-- I'd not ever purchase foods for my baby that delivered estrogen or other hormones into his body, so why would I consider offering breastmilk with hormones in it to him? It answered it for me immediately-- I opt out of hormonal birth control until my baby is weaned. She said that most OBs will prescribe hormonal birth control to their patients even if they are breastfeeding, but that the bottom line is that we don't know what these hormones are doing and will do to our babies long-term. It made me sad for all the babies out there exposed to the hormones in birth control via breastmilk. And I opt to not wean my baby in order to use hormonal birth control, either: his breastmilk is so incredibly good for him that I will not pull it from his diet before he's ready to say goodbye to it. Instead, my husband and I will look for other ways to prevent pregnancy until he is in the all-clear zone for his pending vasectomy. I won't take chances with my baby. He deserves a hormone-free breastfeeding experience.
So. For what it's worth, this was my own thought process. I hope all mamas will consider this through these lenses, and consider coming off hormonal birth control if breastfeeding. Doctors will tell you there doesn't seem to be risk involved, but I would challenge you to ask them if they'd feed their own children milk bought at a store that contained estrogen or other hormones added to it, and see what their answer is.
You are such a kind and thoughtful mother to consider what this is doing to your baby. Every baby should be so lucky, R..
The best of luck!
Warmly,
JennyC.