Hi, PCOS and cyst in brain of your child are two unrelated things. Cyst in brain or spinal cord are called as neural tube defects and can affect the development of the baby, depending on their size and location. You need to get a detailed scan done by an fetal medicine specialist, to know that exact nature of the cysts. Also the babies head needs to be checked for excessive fluid (called Hydrocephalus), as these are known to occur together and can affect the baby. The fetal medicine expert can further guide you regarding the prognosis of the baby depending on size and location of the cyst. Some of these cysts are correctable after delivery for which you will need to be in touch with a pediatric neurosurgeon. You have conceived, so it means your PCOS is in control. If you have irregular periods after 6 months of delivery, then you can take medications for it. Also Women with PCOS are prone for gestational diabetes, do get your sugar levels checked. Also consider folic acid 5 mg at least 3 months before the next pregnancy as folic acid is known to protect against neural tube defects. Hope this helps. Regards.