I had a scan at 32/33 weeks with DD1 checking up on a previously low lying placenta and was told then that she was enormous and had a particularly large head. Being my first baby, I stressed a bit until my OB told me its all nonsense, and then spent the next few weeks joking about my baby about to be born with a 6.5kg head. She was born spot on average for weight, length and head circ.
SIL was told she needed an induction because her baby was apparently tiny, and there was concerns of him not getting enough from the placenta. He was born 2 weeks early at 4kgs.
So, as far as I'm concerned, they're not worth it in terms of diagnostic benefit. Maybe you just have the penthouse of all uteruses and your baby can stretch out a bit more than others, thus making him/her measure bigger. Who knows.
I would have the scan if you want to see bub again, or if you want to take the opportunity for your kids to see a scan. Otherwise, no.
My understanding was that at your 20w scan bub can be 2 weeks either way in size because they're so little anyway....
Based on that theory, I'd say no. I had heaps of 3rd Tri scans with DD and sizing IS NOT ACCURATE. DD was severely growth restricted and had stopped growing and I had a final growth scan 2 days before she was born and it predicted that she would be 2lb 10oz. She popped out 2 days later at 3lb 12oz. I know alot of people who have scans before delivery and there can be 2+ pounds difference in actual birth weight.
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