Curdled milk is not because of improper burping.. actually it's good it means she is extra fed. Milk immediately after feeding is also normal. The baby should not vomit .. these 2 things are normal. Im sharing Sonali Shivlani s anwer when I asked this Q few days back.

Hi Merline, 
Whenever your kiddo spits out fresh milk, it means he or she is full.; The curdled milk might be happening due to more than needed feed. Please don't worry. Read these <a href="http://app.babychakra.com/article/2938">Is Your Baby Ready For Burping?</a>

Fresh milk is normally excess feeding and curdled milk mean baby have digested so nothin to worry.. burp ur baby after every feed

Burp after every feed Nd fresh milk splitting is not good so hold Ur baby upright position for 30 min after feed

It is completely normal and nothing to worry. After every feed burp the baby well. It; is just the excess that regurgitates.

my baby spits milk out.; Sometimes it is curdled milk nd sometimes fresh milk.; What does it indicate?; Anything to worry