Is it normal for the baby to be bigger then what she I supposed to be.

Elizabeth
So I went to get an ultrasound done and the doctor told me that the baby was supposed to be about 2.9 pounds and she is 4.3 pounds and she is at the 85%park and if she hits 90% they might induce my labor has anyone heard of this or went through this am wondering if they will deliver me or what will actually happen if she reached this 90%mark