2 kitten only

my momma Gizmo is a tuxedo.  she gave birth to 2 kittens yesterday  it has been over 12 hours  I don't feel any more.  I'm certain only one male got a hold of her.  is this normal.  she is good  eating  drinking  has used the littler box once    feeding them  bathing them.  not showing any more signs of labor 

She may have not been very fertile.  Some cats only have one kitten when others have ten.  All depends on how fertile they were when they were breaded

Some cats, especially young ones and with their first litter, often don't have many kittens.  Maybe one or two.  I believe it can also run in a cat family; Mouse was an only kitten early on his mother having kittens and was an only kitten.  His maternal grandmother was also an only kitten.  As long as your cat seems comfortable and well, you can not feel or see any sign of further kittens, and she is taking good care of both her kittens I don't think this is anything to worry about.  

 Congratulations.  I hope all are well and comortable.