In general, belching is normal and physiological and most people belch after meals. Belching may be associated with muscular weakness at the gastro-esophageal junction and may bring along with it acid from the stomach resulting in heartburns. This is not necessarily problematic unless the heartburn becomes frequent or disturbing.
Bacteria is present throughout our digestive tract and each person has his or her own bacteria colonies in various quantities depending on their diet. The definition of bacteria overgrowth is therefore somewhat arbitrary and largely based on the belief that excessive bacteria growth manifest as bloating or abdominal discomfort. There are different tests available to diagnose bacterial overgrowth but the result interpretation is again based on certain assumptions.
As such, instead of deciding whether there is bacteria overgrowth, a more practical approach for you may be to try a different diet or eating different amount each meal. Consuming a diet with less sugar and more fibre plus regular exercise may benefit you more than you expect. Avoiding constipation and consuming more fluids may also help with bloating.
