During an ultrasound, what if fluid is noticed on babies brain?

Depends on variables: There are spaces within the developing brain where fluid is supposed to be.The size & shape of these spaces is sometimes visible depending on the type of study sensitivity of the probe used. If the fluid collection is excessive, the feature will be monitored. Many will require treatment after delivery and some before. Each case is managed based on individual features.

Detailed Survey: If hydrocephalus is detected during a fetal ultrasound, a detailed evaluation of the fetus would be performed in an effort to detect causative lesions or associated anomalies in order to better guide further assessments. Amniocentesis for genetic evaluation is frequently suggested as well.

Serial ultrasounds: Will show if the fluid ⬆es or stays stable. The OB may ask a perinatologist or fetal-maternal medicine specialist to follow the pregnancy & help decide the safest timing & mode of delivery. (s)he may ask a pediatric neurosurgeon to review the fus's & be available at delivery, if need be. You may wish to consult a prenatal genetic counselor. Developmental follow-up after birth would be wise.