For nursing, the best time to have a maternity breastfeeding bra fitted is around 36 to 38 weeks.
There are online bra size calculators that show you how to measure yourself and work out your bra size. Different brands of bras have different sizings, so use the guide suggested.
Bras purchased during the last weeks of pregnancy should have enough room both in the cup and around the ribcage to allow for slightly larger breasts when the milk flow comes in. Though the amount of "breast size increase" does vary between women, we can't just make a general suggestion to go up X cup sizes. A bra that is too tight, either around the ribs or in the cup, can cause a plugged milk duct or breast infection.
Breastfeeding bras have a drop down clip, which you can open with one hand (while holding the baby with the other hand). You will also need to purchase washable breast pads or disposable nursing pads or the new style of Lily Padz which fit inside your bra and absorb the milk that may leak from the nipples between feedings.
We have a large variety of maternity lingerie available on our specialty breastfeeding site. Our most popular items are the Hotmilk Lingerie which have four different bra styles each season.
Our current season has a gorgeous black and white lacy bra style with matching knickers, a simple white breast feeding bra with floral pattern, a gorgeous pink lacy tshirt moulded cup style nursing bra, and a stunning blue satin moulded cup feeding bra.
You will most likely need to wear a bra 24 hours a day, so for a comfortable sleeping bra we suggested the Rocket Bra by Womama. This is super comfortable to sleep in. There is also the Glamourmom Nursing Singlet which has a built in shelf bra, also comfortable for night time wear.