Whats more accurate?

[turbo_mom]

So i'm at just over 20 weeks and I have 3 different sources telling me different measurements of the baby.
On my pregnancy calendar it says it's 9 inches.
On babygaga.com it says 10.5 inches and my pregnancy week by week says crown to rump is 5 2/3 to 6 1/2 inches. (crown to rump being the babies length while its curled up right?)

So should I go by my book?? I don't know which is accurate and so many things are saying otherwise lol

 

[princess2323]

im confused about this too--- but not just the length but the weight as well---my baby measured 13 oz at 20 weeks and i dont have the length measurements they said i could get those friday--- but everywhere i looked 13 oz seeemed a lot for being only 20 at the time--- it was closer to like 22-23 weeks

 

[princess2323]

id go by the ultrasound itself since its most accurate for ur baby everywhere i;ve looked they say that those numbers are just averages and ur baby could be measuring smaller or larger at the time or could be going into a growth spurt or just had one---for instance my belly measurement is measuring large for dates 25 cm at 22 weeks so who knows...