Hiccups after each feeding?

My daughter is 8 weeks old and formula fed due to extremely low supply of breast milk. She gets the hiccups about 20-30 minutes after each feeding. It doesn't seem to bother her much, but is there any reason why it's happening after each feeding? She's burped after every 1-2 ounces. I notice it seems to happen more if she becomes active after a feeding. Should I be concerned? Normal? She's getting enough to eat and not overfeeding, so I don't know! :/