I was given a nursing supplementer to use with my twins, when we were struggling with both undersupply and ineffective latch. It was only later (as I became much more educated in supporting breastfeeding) that I learned that a nursing supplementer is not effective for teaching proper latch and suck. It's an excellent tool to keep baby at the breast while building supply, but if milk supply isn't the issue, it won't help your baby learn. It's too easy for baby to "cheat" with a supplementer and learn to get milk flowing without using the proper suckling technique to remove milk from the breast.Â
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I'm not clear what's happening when you try to nurse. It sounds like your baby latches, but then does not suckle. Or, does she suckle but not stimulate a let-down? Or does she refuse to latch at all? Has she ever latched? Ever had a good nursing session? How you approach this depends on what exactly is happening when you try to nurse. With the amount of milk you're pumping at a session, I wonder if oversupply could be affecting her willingness to nurse. Does she get mad when the heavy milk flow starts and refuse to nurse?
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If your baby is used to bottle feedings, she may be unwilling to suck long enough to stimulate milk flow at the breast. If she does latch, you can help her out, either with breast compression or by pumping to the point of let-down and then offering her the breast. This way, she'll get an immediate milk reward and will hopefully be stimulated to suck. You can keep using breast compression whenever your natural flow slows down so she doesn't get frustrated. Jack McKenna has a good description of compression at http://www.drjacknewman.com/help/Breast-compression.asp.
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You said you'd seen two LC's. Were they IBCLCs (board certified lactation consultants) which is a rigourous education & testing program? Anyone can call themselves a lactation "consultant". Irregardless of whether/ not they were IBCLCs, you might want to see a third, but specifically look for someone with experience working with non-latching babies. Your local La Leche League can probably help you find someone with experience (Leaders often know the IBCLCs in the area, or can get referrals from others). Babies can learn to nurse after months (and some babies learn to nurse even after a year of age), so you have time. The biggest challenge for most moms in this position is keeping milk supply up with pumping alone, but sounds like you've got that covered.
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The others suggestion I have for local support is to get a referral to an OT (occupational therapist) who has experience with lactation. Your baby may have some physical issues that are causing her difficulty with sucking. Using a bottle isn't a good indicator of ability to suck, as gravity will let the milk flow even if baby doesn't suck. An OT can evaluate her suck and can teach you exercises to help her learn. CST (cranial-sacral therapy) might also help.
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Have you learned about paced bottle feeding? You want to make bottle feeding as much like breastfeeding as possible, so your baby is more easily able to transition. A good place to start is at lowmilksupply.org (http://www.lowmilksupply.org/bottles.shtml). You might also want to read the information at this site on nursing supplementers, more details about why they probably aren't the best solution for you and your baby).
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Good luck. As long as you have a good milk supply, your baby can learn to latch. You might just need more help, or to find the right idea to try, or just more time. Pumping is a lot of work and your baby is very lucky you're continuing with this.