<s>[INST] Hi, may I answer your health queries right now ? Please type your query here... I am nearly 24 weeks pregnant and have had lots of scans and an Amnio, my 20 week scan showed my baby to have a small head so I was asked to return yesterday where my baby s head measurement was off the scale on the small side so I have been asked to go back in four weeks. The sonographer couldn t tell me what it possibly meant because she wasn t trained in that field but obviously I am very worried. She mentioned genetic disorders of which the Amnio tested the major 3 and I got the all clear. What other genetic disorders could this dipict. [/INST] Hi, Detection of a small head, that is size of head smaller than expected for that fetus could mean a lot of things and sometimes could just be an incidental finding. I would like to ask you if you have had any fever or infection in this pregnancy as some viral infection can also cause this microcephaly (small head). Since you have already had the amniocentesis which has confirmed that you don't have any genetic syn Chat Doctor. Get blood investigations done to see for viral infections, as apart from microcephaly these viral infections and also cause other growth problems in fetus. Hope this helps. Regards. </s>