My guess is that if made to sign a waver with horrid consequences on that, some women would not sign it, not give their babies formula, and then either not breastfeed as often as needed, or would nurse the 2 days they are in the hospital and then get formula on the way out. Or bring formula with them upon checking in at the hospital. People who want to formula feed by choice will likely want formula feed by choice no matter what they have to sign. People that HAVE to formula feed not by choice might already feel extreme guilt and don't need a piece of paper to make them feel worse.
Until formula is a controlled and/or prescription substance, it is really not falling under the guidelines of medical treatment or something that requires informed consent.
And holy crap, I can't imagine a worse thing to do to a freshly postpartum woman than to give her a paper telling her that she might cause her child's death. Are you going to pass along the zoloft along with that consent form, because telling that to a newly postpartum woman will likely cause some really intense emotions and guilt. Heck, you know, I felt guilty enough when my 36 weeker required formula down a feeding tube because she couldn't swallow, suck, root, and had crashing blood sugar, and I have low supply issues. I don't really need to know that I'm signing her life away as well. And since we DID have a child die in infancy, receiving that consent form would have been a horrible trigger.
ETA: And if you're forcing women to sign informed consent to formula feed and scaring them out of it, are you also up with them at 2 (and 3 and 4 and 5.
: ) AM helping them? Are you there offering support for difficulties? Forcing a woman to breastfeed who doesn't want to breastfeed by scaring the hell out of them seems like it's setting the woman up for a supportless nursing journey, failure to thrive because the mom doesn't have the support to make sure breastfeeding is going well, etc. I'd rather moms breastfeed because they want to and have the support to than to be scared into it.