I totally understand the worry, it's stressful when you're trying to figure out what's normal, especially after switching to formula! The good news is that 2 days without a poop is actually quite normal for formula-fed babies; some can even go up to 10 days and be totally fine, since formula is less stimulating to the digestive system than breastmilk. That said, if he's looking bloated or uncomfortable, a few things tend to help: gentle belly massage in clockwise circles, or bicycle motions with his legs can get things moving, and some mums swear by a bit of gripe water to help with the gas and bloating. The 60/90ml variation you're doing sounds smart too, it takes time for babies to signal properly, and his system is still adjusting to the formula change.
I do want to say honestly that the latch situation must be frustrating for you, and it's worth having a chat with your doctor or a lactation consultant if you ever want to try breastfeeding again, sometimes it's possible to get back on track even after a few weeks. For now, keep an eye on whether he's having wet nappies and seems alert and settled most of the time; those are usually better signs than poop frequency alone. Do check in with your GP or child health clinic just to be sure everything's progressing well, especially since you're navigating a feeding change.
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