Time to take your baby to the vets for a checkup.
Hopefully it's nothing serious. When Kuhio was about 15 she started throwing up every day. Her problem was a hyperthyroid. Her thyroid had kicked into overdrive and was revving up her engine so fast that she was nauseous and started vomiting. It is easily diagnosed with a blood test and can be treated. If that's not his problem, a blood test will tell them what's going on.

Welcome to the boards. What's your cat's name? Please keep us posted on your baby and we like LOTS of pictures.