Hi, my 8 week old DS is a very slow fussy feeder. Takes so long to take a bottle and fusses so much that the milk needs to be discarded before he's done and he's fussy because he's still hungry. We have tried different bottles, different teat flows, pushing longer between feeds, shorter between feeds, different formula, formula for cmpa and intolerance, all of it. He has a bit of tongue tie so unsure if it's an issue with latching in general but health visitor has advised trying a sippy cup as they won't do anything for tongue tied bottle fed babies. Has anyone here had this problem? Or introduced a sippy cup so early? And if so any recommendations? 8 weeks just seems so little to try a sippy cup and unsure if he'd be OK with the flow as he struggles with slow and medium but fast is too fast for him. Any help would be appreciated as we also have a toddler DS and I feel awful when DP is at work all the time, and I'm constantly feeding baby and there's very little time spare to give him proper attention so the mum guilt is huge!