There's nothing to say that wearing underwired bras during pregnancy may be harmful, infact many women do prefer the shape and uplift an underwire maternity bra gives them. The underwire maternity bras are specially designed with softer, more flexible underwires that sit very comfortably with your shape and very unlikely to cause complications. The first changes you may feel to your breasts whilst pregnancy will be around the 6th week of pregnancy and can include tenderness and slight enlargement already at such an early stage. During the first 3 months of pregnancy your breasts may become lumpy, this is quite normal as the milk ducts are beginning to develop. These changes show why it is important to wear a comfortable, supportive maternity bra. Maternity bras hold many advantages over normal fashion bras and include, wider shoulder straps (which help to take the extra weight of your incresed bust size), support panels and adjustable back fastenings to allow longer use as your size increases. Our ranges include plus size maternity bras and maternity bras right up to k cup.