Any day now...anybody have iron infusions before?

Sage

Went in for my 36w ultrasound today, little guy is measuring 37 weeks exactly. 6.5 lbs and 60th percentile. His HEAD, however....is measuring 98th percentile so that's.....terrifying. I got blood work done to find out if I'm going to get iron infusions. Has anyone had them? What are they like?