Step 1 : Introduction to the question "What is the world record for number of kittens born in a single litter of domestic cats?"
...On average, a domestic cat will give birth to a litter of three to nine kittens. In August 1970 a Burmese/Siamese cat in Kingham, Oxfordshire, UK, birthed a litter of 19 kittens. Four of the kitties were stillborn, however. Most cats are capable of becoming pregnant up to three times per year, beginning between five to 10 months and continuing throughout their lives. This is one reason responsible owners should spay and neuter their pets. Source: Animals.OnHowto.com; GuinnessWorldRecords.com