Hi all. My bub is still breastfeeding but occasionally we use formula to top him up or put in his food. We only use 40 ml at a time so it is not worth us buying the big tubs however even the small packets make up 125ml. It seems such a waste to pour out what we don't need. I have done a bit of research and it looks as though freezing of formula is not recommended because of separation, however no-one explains why separation is a problem. "This separation negatively affects the texture and quality of the formula." But does that just mean it is distasteful? Is it harmful in anyway? It is costing us a lot of money in wasted formula.