Longer Arms?

I am 26 weeks 4 days today & I had an ultrasound at 26 weeks 1 day on Tuesday & everything looked great. My daughter was measuring on schedule but I was told her arms were measuring a week ahead of schedule at 27 weeks. Is this normal or has anyone else had this happen? I mean her father has long arms (He's 5'7 but his arm span measures at 6 ft) so maybe she'll just have her daddy's long arms but I just wanted to know if this had happened to anyone else & if their babies legs eventually caught up with their arms lol.