It is probably a good idea to buy a nursing bra with wide straps, as they will need to support more weight than you are used to. (thefashionablebambino.com)
If you're planning to breastfeed and haven't bought nursing bras yet, now is the time. (babycenter.com)
So keep that in mind when buying nursing bras, and when shopping in person look for a salesperson who's knowledgeable about fitting. (babycenter.com)