Yesterday night I gave some breast milk from the freezer to my one year old. And then I tried to give some to my 4 yr old and he didn’t like it. He said “mommy it taste nasty” So I immediately smelled it and it didn’t smell spoiled then I tasted it and it was awful. It tasted like metal or a coin. Now I’m wondering anyone who had a problem with lipase milk? I want to know how to avoid it or fix the problem. I’m currently breastfeeding my 1 1/2 month old.