why cant u wear underwire bras if breastfeeding?

I find underwire bras a lot more comfortable, probably because thats what im used to.. is there a reason why underwire bras are a no- no

It’s a risk factor for mastitis:

http://www.kellymom.com/bf/concerns/mom/recurrent-mastitis.html

Look for anything that results in consistent pressure on the breast tissue — this can block milk flow and lead to plugged ducts. See if you can associate any of the following things with the location of the plug(s): Are you sleeping on one side or on your stomach a lot? Do you carry a heavy purse or bag on one side? Are you carrying the baby in a front carrier or sling? Do you wear an underwire bra that presses in one area? Are you wearing any type of bra that does not fit well? Do you wear a sleep bra that stays pushed up or to the side for much of the time at night? Are you wearing constrictive clothes?

Product review-Nursing bras/tank tops and accessories


Anita Maternity Women's Microfiber Nursing Bra  #5068


Anita Maternity Women’s Microfiber Nursing Bra #5068


$54.00


Seamless nursing bra, Lightweight, stretch microfiber. Underwire cups provide support, Non-stretch center gore. Convenient one-handed nursing clips. Anita, Style Number: 5068….

Condessa Veronica Nursing Bra - Treasured Copper


Condessa Veronica Nursing Bra – Treasured Copper


$55.00


This under-wire nursing bra in shimmering microfiber with a seamless cup gives this nursing bra a modern and glamorous look and feel. The demi-cup with under-wire gives a daring and sexy lift while allowing for breastfeeding access at the strap. Available matching pantie for a beautiful Condessa lingerie set….

Condessa Veronica Nursing Bra - Sparkling Silver


Condessa Veronica Nursing Bra – Sparkling Silver


$55.00


This under-wire nursing bra in shimmering microfiber with a seamless cup gives this nursing bra a modern and glamorous look and feel. The demi-cup with under-wire gives a daring and sexy lift while allowing for breastfeeding access with a clip at the strap. Available matching pantie for a beautiful Condessa lingerie set….