I'm 36 weeks pregnant and feel vibrations/twitches in my stomach. Is this normal? Do babies have seizures inutero??

Likely hiccups. Some have speculated that the close position of the babies stomach to the diaphragm causes a rubbing that triggers the hiccups.This is common & generally continues on through the first months after birth. Once the child grows longer & the stomach can drop away from the diaphragm the frequency declines. It bothers mom's more than the baby.Not a seizure!