Ayy sayang, jangan worry sangat dulu! Tapi untuk peace of mind, please call your pediatrician or clinic today , they can tell you exactly based on your baby's age and condition, okay? Honestly, kalau susu tak ada bau masam or smell off, biasanya okay pa, tapi dengan tengik taste sikit tu, better safe than sorry, doctors dapat advise better pasal baby safety. Few of us moms juga experienced similar, and most babies fine jer, tapi setiap baby beza. Just get confirmation from your doc, and then you boleh relax! Lepas ni, maybe try keeping it in cooler with ice pack if you're out, or label the time on the storage bottle so senang nak track. You're doing great, okay!