It's incredibly rare for your body to grow a baby that you cannot birth. Like extremely rare.
I got this every scan, he was born 6.6🤭
Yes baby's growth can change throughout pregnancy and they be healthy and of average size. I fo also want to add that ultrasounds are estimated sizes, my last pregnancy it stated that my son's head was 2.3 inches from ear to ear at 39 weeks, and I was extremely anxious thinking maybe baby had a birth defect🤣 nope he had a very average sized head
Ultrasounds aren't accurate once you're past this point. Play around and search on the evidencebasedbirth.com website and read up on the "induction for big/small baby" articles. Hospital care is often behind with acting with the up to date research.