Once I get to about 25 weeks I always messure about 3 or 4 cm behind.
None of my babies have been tiny, 7lb8, 8lb3 & 8lb 4.
this one I am messuring 3 weeks behind but ont he growth scan I had at 32 weeks the baby was off the scale big for most the messurements.
Even the midwife laughed that I messure small but obvisouly have abig bub in there.