Tiny baby experiences? IUGR? I'm scared.

My son's measuring small. Abdomen in the 43rd percentile, while his arm bones range from the 14th-26th percentile. Meanwhile, his head & leg bones are all somewhere between 3rd-5th percentile...

They have us doing more blood work & coming back for another scan soon, but I am petrified it could be something serious. My doctor told me if anything, she suspects IUGR. He doesn't show any other signs/symptoms of skeletal dysplasia & we've previously tested negative for a few chromosomal abnormalities.

Did you have a baby with IUGR? Was your baby measuring abnormally small...? How did things turn out?