The back size of my bra has gone up during pregnancy because of my swollen rib cage. I've had to use a bra extension. Normally I'm a 32 or 34 but I'm guessing I'm a 36-38 at the mo. (I'm almost 39 weeks pregnant.) Does anyone know whether my back size (ribcage) will decrease immediately after birth? Will I go back down to a 32-34" back size? The reason I ask is because I'm thinking of buying some breastfeeding bras and not sure whether to be measured as I am now and buy ones according to what I am now or whether to anticipate what I will be after birth and buy according to that. I would like to buy some bras now because I'm pretty sure I won't be going out shopping in the first few weeks of baby's arrival. If anyone has any advice I'd love to hear it.