OMG my defrosted milk stinks

Lyla
I've defrosted my first milk ready to give baby later. She is 3 months old and I have built up a good stash of milk over this time.
However it absolutely stinks of metal and doesn't Taste to great either. 
Have I just wasted 3 months of pumping or is she going to drink it?
I've read warming the milk before freezing will prevent this in future. 
Has anyone tried this and it's worked?

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