I have been feeding 18 month old from one breast for a few months with maybe every other day once the other initially due to pain on one side from scar tissue from ds1 breastfeeding. My supply has not dropped but she does not want the other side so I just assumed that it had been due to comfort but I smelt my breastmilk and it smelt sour. (Don't judge me) I then tasted milk from both sides and the right side was sour and the left sweet. Does anybody know if there is a reason for this?