Hello
While
seizure in first week of birth was related to
hypoglycemia, second episode seems to be unrelated to sugar level. I am sure doctor must have checked up sugar level during second episode.
Periventricular leukomalacia is not a specific finding for any disease. Possible explanations are (i) due to episode of prolonged hypoglycemia or
hypoxia during first seizure, (ii) any disease like metabolic disorder is there and your doctor will investigate for it, or (iii) it may be normal and only follow up will confirm. Your doctor might consider for an EEG and anti-epileptic drug for the baby.
Wish all the best
Pratap