Hihi any idea what could have caused a 6mo on fm to puke (Merlion) after milk feed while burping?

Does it always happen or this is a one time off incident ? If it is a one time off incident I think you don't have to worry. It could be her digestion was not so good that day and also she probably suck in too much air during feeding. Maybe you need to burp her a few time during her feed.My gal used to burp milk out after feeding and it stop naturally after 7 months. When she could sit upright without assistance it got better naturally. If she always burp milk then she could have reflux problem which there is nothing much you can do and just wait for them to outgrow it. If it is serious puking everyone like Merlion kind PD will prescribe medicine for reflux. Another method to prevent reflux is to hold baby uptight or at least 45 degrees for about 15 mins after she drinks milk. Sometimes I will wait a while for the milk to go down before I burp her, if I burp her immediately after drinking she will surely puke some milk out .