You may change size right away, or it might be in 2nd trimester; but everyone's body changes during pregnancy. We have these pieces to grow and stretch with you, before, during and after baby. Practically speaking, not only for your wallet but for the planet, it is most practical to buy your maternity wardrobe with nursing access. So do yourself a favor and buy as many pieces with nursing access. Not all of the pieces in our collection have the nursing access, but we try to focus on this as well as style and quality. Bella Materna for before, during and long after.