Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Any gagging, retching, lip licking, drooling or vomiting?
Any changes in his breathing or does he seem sore in his mouth?
Are his gums pink or pale/white? Moist or sticky?
If you press on his belly, any discomfort, tenderness, or tensing?
Where are you pressing when you lift him?
Could he have eaten something he should not have (ie bones, toys, plants, chemicals, etc)?