I am not a nursing mother but I needed a sleeping bra that has some support.  I normally wear a 42 DD/DDD & purchased the XXL Busty based upon the reviews.  This is pretty comfortable and soft.  It  meets my needs.  I do agree that it pulls on the shoulders and rolls at the bottom, which could be uncomfortable to some but not for me.  Im also not spilling out of it which tends to be the problem with most sports bras and sleeper bras that I purchased.