Growth scans - low femur length

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Hi, I'm not sure if this is the right section, but wondered if anyone had any experience of this. Had a growth scan at 28+4 and they flagged that baby's femur length was under 5th percentile. Humerus length was in proportion to the lower femur length (so also small, but not plotted on the graph).

This is in big contrast to the abdomen, which measured over 90%, and the head which was about 60% I think from memory.

Looked back through previous scans and his femur has always measured pretty small. I've another scan in three weeks, but getting very concerned about potential issues like skeletal dysplasia etc. I had the NIPT which was clear and the sonographer said the bones look fine, with no abnormalities identified at 20 week scan.

Did anyone experience this and what was the outcome? I'm not sure if I'm panicking needlessly, and it's kind of ruining how I'm feeling about my pregnancy at the moment. Just to mention also, at my dating scan I was moved forward by more than a week from my ovulation dates (I charted) so maybe he is just younger than they think. I don't know if this affects

My daughter's abdomen was always measuring much larger than everything else on scans. She ended up having CMPA (cows milk protein allergy) and once we cut out dairy, her abdomen size reduced to normal proportions. Just might be worth having in the back of your mind in case you have other issues that point to that. They wouldn't recommend changing your diet during pregnancy.

Thank you for the comments!

@toddlingabout I think the fat abdomen on mine is gestational diabetes, but I will for sure keep in mind an allergy if any issues after he's born with feeding or weight so thank you for the tip

Just to update again, I had my baby and he has no issues with arm or leg length. He also is very slim and measures about 50th centile for most measurements. So the scans were a bit off