I have three six month old kittens and all are males. They were born our cat in our home in October last year. All was going well until one and half months back when one of the kittens got diarrhea and then he stopped eating and I kept him on liquid glucose and ORS to prevent dehydration. I went to a vet and he gave some antibiotic shots and the kitten improved somewhat. He started losing weight and the effect is more pronounced as the his litter mates are growing stronger and he is becoming more skinny day by day. Then I noticed that he has not gone for potty (although he urinates normally) in two weeks so I gave him Dulcolax suppository and he defaceted after 3 hours. He also developed skin allergy on the face which I Healed with anti bacterial cream. He is active but fatigues very easily. He eats and drinks regularly but in small quantities. His Litter mates now have weight of around 2.5 times his weight. His voice has become more bassized and you can see his ribs. His stomach has shrunk very much. What is the illness??