A cat typically shows no clinical signs immediately after infestation, but in time, she may develop a potbellied appearance, or she may lose weight and have a dull coat. (vetinfo.com)
Most kittens have roundworms, which are intestinal worms that can cause coughing, weight loss, and a potbellied appearance in cats (although they may not cause any symptoms). (winslowanimalhospital.com)
Kittens with active roundworms in the intestines often have a potbellied appearance and don't grow as well as non-infected kittens. (1800petmeds.com)