Hi MaureenjScott,
I believe the issue was brought to your Bishop's attention by others who may not feel comfortable enough to come and tell you. Also, I know that the mother's lounge in some wards are very tiny and some branches don't even have the amenity. However, because the mothers lounge is so small-I have breastfed my children right outside the sacrament meeting room with a large blanket over me. However, just keep in mind that the Bishop was only trying to bring something to your attention maybe in the request of others. I have a baby sling that I LOVE to use and I would just wear nursing shirts so that I could put my babies to the breast anytime they needed and I would constantly keep the blanket over my shoulders! Just keep doing what you're doing...Just know the Bishop and his counselors love you and your family and are there to help. Take care!
Aloha, Pixieflower