Our 10 week old baby has started to bring up milk after feeding. He is probably bringing up 10-30ml after most feeds, and has been going on for about 10 days.
It doesn't seem to distress him at this point, and there is no acidic smell when he brings up the milk, but we are worried that this may develop if he continues to do it. At this point, the main worry is that he is losing a lot of the milk that he is taking in.
He is being fed a mixture of breast milk (as much as I can produce) and Hipp Organic formula milk.
If you don't already, try to feed him in an upright position as you can to see if that help. Even putting him in a baby rocker as far straight up as it'll go might help. If it doesn't change, then I'd take him to GP to check him over. You could also try changing the type of formula and see if it makes a difference.