Feline gestation: 63-65 days (average 64 days)
Cat pregnancy (gestation) lasts 58-72 days, averaging 64 days. Week 1-2: Fertilization and implantation. Week 3: Nipples enlarge and pink ("pinking up") — the first visible sign. Week 4: Morning sickness possible, vet can confirm pregnancy by palpation. Week 5: Belly starts to swell. Week 6-7: Kittens visible on X-ray, queen's appetite increases 50%. Week 8-9: Nesting behavior, milk production begins, kittens moving visibly. Average litter: 4-6 kittens. Prepare a quiet birthing box lined with clean towels. Increase food by 25-50% during pregnancy — kitten food is ideal. Prenatal vet visit at 4 weeks is recommended for ultrasound confirmation and health assessment.