Frequent hiccuping at 35 weeks

Claire • 04.10.18 baby boy

When should I be worried about my baby’s frequent bouts of hiccups? He hiccups for 5-10 minutes at a time, 4-5 times in a day. I’ve noticed that these bouts happen a lot more than they used to, could it possibly be an umbilical cord issue? Should I let my ob know or would she just dismiss it until I’m closer to my due date?