I need some advice from any mom's of multiples or singletons who's Babies developed newborn acid reflux. My twins were doing fine breastfeeding but now at almost 4weeks old, they have started throwing up my milk? They both eat in a sitting position and they both burp really good, but about a few minutes after they eat, it all comes up again sometimes with mucus?. Not clumpy but exactly the way in went down if that makes sense. Any advice would be greatly appreciated. Also they have been extra fussy and wanting to eat more often.