Bad Breast milk? Will baby be ok?

Li

So I'm not sure, but I left a bottle of breast milk on my husband's night stand before going to work so that he wouldn't have to get up. The breast milk is about 4-5 days old and has been kept in the fridge. However, after I warmed it up I noticed it smelled a bit off. I did taste it and it was a lil off but not too off putting. I figured since its been in the fridge this entire time and it isn't even a week old, it should be fine even though it smelled and tasted a lil off.

However, my husband says the our kiddo (9months old) didn't really seem to want to drink it. He did get him to drink most of it eventually though.

Im wondering if the kiddo was being difficult because he wanted the boob and not a bottle? Or if he was being difficult because the milk was bad?

If the milk was bad, will my kiddo be okay?

Any advice or suggestions?

Update***

Just got home from work and kiddo is doing great. :)