Infant seizure?

So i had my 3 month old on the bed while i wad fixing my 3 yr old daughters hair and i happen to hear the baby like grasping for air and puke coming out her mouth i picked her up and she stopped doing what she was doing! Her eyes was like teary eye but as soon as i picked her up she was fine!:/ i can't stop crying does she sound like A seizure?if not how would i know if she had one