There is a link between cow's milk allergy and reflux in infants. It's not a good idea to make major dietary changes without professional support, but you could keep a food and symptom diary for both of you and see if that pinpoints any trigger foods.
All babies have some degree of LES laxity, so it could be just one of those things that passes with time. And some toddlers never throw up but others do so every time they have a sniffle, so I wouldn't leap to any conclusions yet, especially if the little fella is a good weight and otherwise well!
New stuff: GERD, Recurrent cystitis/Overactive bladder
Lifelong stuff: Food allergies/intolerance, eczema, asthma