Debbie, I'm so glad that you took him to the vet and had blood work done. Hopefully everything will be normal.

Does he play a lot with his younger siblings? If so, then maybe this is the reason why he's lost some weight. He may be getting more excerise than he did before you had them. Maybe he should start eating a food that's higher in calories. I know that even though my Sunny is 5 years old now, he also needs higher calories than his 3 year old brother Sky. I'll be praying for good news. Take care.