An increase in the measurement of the lateral ventricles in fetal ultrasound, especially if it's a mild increase, may not necessarily indicate a severe issue. It's important to remember that ultrasound measurements can sometimes have a margin of error. Please consult a gynecologist in your locality for proper diagnosis.

Taking principal Ferrite pills in week four of pregnancy can be harmful. Iron is present in this pill, and it can be risky when one is expectant and does not require it. It’s advisable not to use it at this time. Consult your gynecologist if you need additional iron supplements. They will advise you and the baby on what is safe for you.

Your ultrasound shows an area calle­d the citerna magna, which is part of the baby's brain. This space­ usually measures from 3 to 10 millimete­rs. At 9-10 mm, your baby's citerna magna size falls within normal limits. This is typically harmless and most babie­s don't experience­ any issues related to it. Continue­ with your regular prenatal checkups and monitoring with your gynecologist.