What fantastic job you are doing. My daughter tandem feeds her 2.5 YO and 6 month old. When she was pregnant she also talked about how lucky DS1 was that he could have chips because he had teeth and that the new baby had no teeth and could only have milk. She has had no problems at all, darling DS1 loves his baby sister and is happy to wait for his turn. Tandem feeding is also great for supply and my daughter has never had problems with blocked ducts. I loved breastfeeding and I am so proud of my daughter and her beautiful mothering skills. Enjoy your beautiful family.