My son had neonatal seizures and was put on medicine, but after a few months they stopped. now he is 5 and is having what we think are absence seizures(waiting for eeg results to come back). could these be related to him having neonatal seizures?

Different: Although they both involve the brain they are usually different in their origin/pattern and eventual treatments. Absence can be confirmed by EEG with a typical pattern.

Possibly: The causes of seizures are multiple and include early brain injury and changes in the developmental structure of the brain. The EEG and possibly head CT may be provide additional information. A review of the neonatal records may be completed by your PCP or Healthtap by uploading the documents eg discharge summary to an inbox consultation.