Stomach noises sloshing?

Hi My husband is awaiting biopsy results for endoscopy, colonoscopy came back clear including biopsys apart from divtiolsis. Endoscopy everything looks normal taken 4 biopsys to rule out celiac due to weight loss. Last night his stomach noises woke me up like a sloshing around noise like I gas sound, only then I clicked it was his stomach. Thinking back this has happened for a few good months. My husband said his stomach bubbles sometimes has anyone else experienced this? 

 

Thanks again x