Doesn't look like seizures symptoms.

Hi, my son is now 7 days old. He is born preterm at 36 weeks by c section. Weight at birth was 2400 gms. He didn't require nursery or any special attention. Everything is going normal as the baby is active and taking feed as normal. He is passing stool and urine normally too. Has shown no discomfort so far about any pain anywhere. Today I breastfed him, he took his burp. About an hour later, he started throwing his arms and legs vigorously. It also seemed he was choking and was unable to breathe. It happened for about 5-10 seconds. I rubbed and patted his back, took him on my shoulder and he got normal after that. But I didn't see him throw anything back that could have caused choking. After he got normal, he remained quite for 2-3 minutes, though had his eyes open and looking fine, but was not reacting to me. Few minutes later, he was reacting absolutely normal. I am scared about what could that have been and the reason for it. Kindly suggest. Doesn't look like seizures symptoms