Hi I just adopted a 2 month old male cat last night from a city animal shelter and when we got home I was playing with him and noticed a bulge on his belly.(it is soft and can be pressed in) When we lay him on his back it pops out more. It doesn't seem to cause him pain or anything though. What could this be? And should it be a cause for alarm if it doesn't seem to be effecting him? I also don't know if it has anything to do with it, but he is pretty underweight too, we even have to wait a few weeks to get him fixed. Has anyone else experienced this? And I do plan on calling the shelter ASAP to see if they noticed it too.