31.5 weeks baby size

Kat • I am a Texan abroad with my sweet hubby and a beautiful 19 month old daughter and trying to conceive our second child.
I just had my 31.5 week appt and ultrasound and the doc said the baby was a little small. I am wondering what sizes everyone else's babies are at this age? My kiddo is 16.5 inches and 3.8 lbs.