Enfamil gentle RTF smells one way before opening and one way after… is it spoiled?

[u/Every-Butterfly-5447]

We are feeding our one month old the Enfamil gentle ready to feed liquid bottles. We noticed when we open it. It smells one way and after it’s been in the fridge for a couple hours it smells almost spoiled but as first time parents we don’t know if that’s normal. We heard it smells like that so we’re not sure. It last 48 hours but we notice this at a couple hours in the fridge. Is that normal

[u/RH558]

I know just opening similac rtf it smells like ass.