BBEthan, for K is on new version of Similac. After he started spitting up, I mixed it with the old versiom as recommended by
Winnie Mummy who called Similac. The situation din really improve much, he just spit up less frequently and less amount, but he began to spit up even breast milk! After all the trail an error, I now feed him in small quantity and more meal. He ever took 2oz of FM from the 4oz I prepared, and can still spit up, so I am very sure it is not caused by over feeding.
I now stick to 4oz, and give him in 2-2.5hrs, burp him longer in the day.
The spitting up seem to be ok in the night, after the 8pm feed, He KO, so I cant burp him as long, same goes for the 4am one, I can give him both the breast and topped up another 2oz (surely more than 5oz) and dont burp him at all and he is fine.
I suspect for K's case, it;s not just the new version, also bcos K is very active and can caused the milk to get pushed out.
Hope Amanda will be well soonest!