My first was little.
3.5kgs (7lbs 7oz)
I was induced at 12 days over which ended in a c-sec.
My second was big.
At 37 weeks I went for my check up and was told due to the babies size I wouldn't be able to have my VBAC.
When I asked how big we were talking the OB just looked at me and said "big"
I requested a GD test as the one I had at 28 weeks seemed high to me but was apparently fine.
2 days later I got a call from the hospital asking me to come in.
I was 37w 3d and just as I was about to leave to go to the hospital in regards to the test results my waters broke and contractions started pretty quickly, I was 6cm by the time I got to the hospital and was getting peeped for a c-sec.
Turns out I did have GD, hence big baby, and she was born via c-section at 37 weeks 3 days weighing just over 5kg (11lbs 4oz)
In my case my large baby was a natural start to labor at 37+3 weeks which seemed to progress faster.
And my smaller was an overdue induction that seemed to take forever.
I don't think size was the cause, I think it's just that every pregnancy is different.
I've heard of people have the opposite to my experience.
I don't think a "big baby" is a reason to induce either.
I wish I was never induced with my first and just waited.