How do I know if my cat has more kittens inside her?

The 11 Signs That There Are More Kittens on the Way

  1. Panting. Heavy breathing is a telltale sign of labor. …
  2. Vocalization. …
  3. Straining. …
  4. Licking of Genitalia. …
  5. Aggression. …
  6. Placenta or Afterbirth Did Not Pass After Last Kitten. …
  7. Fluid-Filled Bubble in Birth Canal. …
  8. Lack of Focus on Newborn Kittens.