This sounds alot like what my Winston does, he's 3 years old, but this has been going on for close to a year. He is not tiny, about 7-8 lbs, and he has always ate very well. The very 1st time it happened, was at night, there is no emergency vet in our town, we didn't know what brought on the seizure, but he came around on his own with really no treatment, just holding him and talking to him. But the next time it happened was during the day, and I took him straight to the vet, he was still in a seizure. At first she thought it was heat stroke, but he had been in the house and it wasn't that hot. Of course they kept him for observation. The only conclusion they came up with was low blood sugar, it was around 40ish. But she kept asking me if I or he had been doing anything out of the ordinary...And I remembered...I had caught him eating a mushroom or toadstool out in the yard...she immediately said that was the answer...it causes hypoglycemia...Hmmmmm...I thought, ok, but that still didn't answer why it had happened the first time, which was late at night, could it be the mushrooms? I really don't think so, because he continued to have seizures...and I watched him...no mushrooms...The vet said all his test came back good, no permanent damage. Anyway, I now feed him canned food along with his dry kibble, twice a day and no seizures, but he has put on about a pound since I'd started feeding him more to keep his sugar up, I'm almost afraid to change his food to a light variety, cuz he really likes it and he's had no more seizures...every time he had one I thought, oh no, he's losing more brain cells and it really is scary and sad at the same time, I just hate to see him like that. I certainly hope you find an answer to your question, and that your baby never has to go through that again. Please keep me informed, as to what you hear from your vet, cuz this has really had me puzzled, I know I've posted very similiar questions on this forum, gotten some response, but nothing that really sounds like what my Winston(and your baby) are doing. Some people have suggested getting him tested for liver shunt, but my vet said it's not that, because he is definately not undernourished and his test have all been negative. The only symptom he has is seizures, and he really gives very little, if any notice that it's his blood sugar, he's not tired, or listlless, he's fine one minute and seizing the next. My thoughts and prayers are with you, take care of your little one and good luck!!!
