Does anyone else have to get frequent ultrasounds to check on baby's growth ? Could use some support. I'm 33 weeks and my belly measured at 30cm and I got an ultrasound 2weeks ago she was 3.5lbs and In the 34th percentile for her size so why do i have to get an ultrasound again in two weeks to check on the baby again? My doctor says shes not worried and I'm just small they just want to make sure everything is going smoothly