I have created a short video to help mum's decide when a Medela PersonalFit breastshield may be a viable option. If part of the Areola (the area surrounding the nipple) is being drawn into the breastshield whilst expressing, a smaller '21mm' breastshiled may be a good option. If however, you are experiencing some chaffing and nipple soreness when expressing, a larger tunnel width may be a better option for you. Large PersonalFit breastshileds are available in 27mm, 30mm and 36mm tunnel options. The breastshiled supplied with your Medela breast pump has a 24mm tunnel width as standard. Visit: www.poshmums.com to see more.