Hi, Lamotrigine is known to cause birth defects , which can present with reduced levels of liquor. but since you have epileptic seizures it is very important that you continue the medication throughout pregnancy. To check the baby for defects, we need to get a detailed malformation scan by a fetal medicine specialist. Neural tube defects, heart anomalies, kidney defects and defects in mouth are more common in women on epileptic medications. Also undergo a fetal 2D echo scan to see for heart abnormalities. Ultrasound doppler studies to assess the growth of the baby from 28 weeks will be required. Hope this helps. Regards.