I'm having a hard time getting my little guy to latch onto my left side due to a flat nipple. He's my third, and with my previous two babies I had to use a nipple shield the whole time I nursed on both sides. This time, I've managed to get him onto my right side without any trouble, but my left side has been awful. I started using a nipple shield on that side and it hurts so bad. It's like pins and needles the entire time he's feeding. I'm wondering if the shield is too small for my large nipples. Is this possible? I'm using the Medela standard size (24mm). When I pump I'm using the larger flanges and I have no pain at all. Do you think it's possible that I need a larger size shield? If so, do they even make such a thing? Do you think it could be something else?