The growth scan is typically done in the third trimester of pregnancy, i.e after the 28th week. The main objective of this scan is to assess the fetal size and the speed of growth (growth velocity). The scan is typically advised at 34 weeks if there are no other risk factors in the pregnancy. However, if there are any risk factors, then the monitoring usually starts at 28 weeks. In addition to testing the fetal well-being, this scan is also utilised to correctly identify if the fetal head is in correct position and if the placenta is away from the neck of the womb.