Hay, it's so hard to tell sa ganyan age! From what I've noticed sa babies ng friends ko, kapag nasamid talaga sila parang may choking moment at nakakagulat ka, pero kapag occasional cough lang habang kumakain o tumitibok sila, baka reflux or swallowing adjustment pa lang, lalo na kung wala siyang iba pang signs like difficulty breathing or congestion. Since one month pa lang si baby mo at wala siyang other symptoms, siguro okay lang, but I'd definitely mention it sa pedia on next check-up para sure ka na walang worry!