after anomaly, next scan is done around 28-30 weeks which is called as growth scan. It looks for the baby’s growth, and other parameters. However, can be done a little early - if your obgyn thinks it’s necessary. or if there is any suspicion about the growth. (in certain groups, an echocardiography for the baby - also an ultrasound is done at 24 weeks). once in a month check up is suggested for singleton babies till 28 weeks.