Final answer:
Growth scans in multiple pregnancies are typically performed every two to three weeks, starting from around 24 weeks of gestation to monitor the health and development of the fetuses especially during the rapid fetal growth in the third trimester.
Step-by-step explanation:
The frequency of growth scans in multiple pregnancies may vary depending on the specific circumstances and the policies of the healthcare provider. However, current medical guidelines suggest that growth scans should be performed every two to three weeks starting from around 24 weeks of gestation in multiple pregnancies. This schedule helps to monitor the growth of each fetus and the presence of any potential complications early on. Growth scans are important because they help to ensure the well-being of both the mother and the fetuses. Especially considering the rapid fetal growth that occurs during the third trimester, consistent monitoring can provide crucial information regarding the health and development of the fetuses.