Following, my son has been doing this and I keep him up for ages. I’ve assumed it’s reflux & just try to keep him upright as long as I can after feeds
My LO is 3 weeks old and does this. I've been using Infocol before every feed and it seems to have helped dramatically. She will V V occasionally bring up posset if she's had a big feed x
My 2 week old seems to be the same also breastfed. My assumption has been that it's milk coming up from the stomach so its mixed with stomach acid to create the lumpy bits. I've not spoken to a pro about it yet mostly coz I keep forgetting too