Sleep movement or seizure. Pls suggest!

I have a 7months and 3weeks old normal born male baby.Last Monday he played till 11.30pm and slept at 11.50 pm. Around 12.15am he turned from flat position to one side position and started moving his right hand and left leg for continuous 10to 15sec and his eyes were half open and moving (as if trying to awake from sleep) . During that 15sec my wife tried feeding and he did not take feed. After 15 sec he slept and immediately my wife started feeding he took the feed. We are not sure what was it. But the leg and hand movement looked like a seizure but not body was not hard. His head was moving slow as if getting up from sleep. What this could be. We are very worried as the right hand and left leg movement looked odd .pls suggest