Cat Pregnancy Timeline: When Does the Belly Start to Show?

Feline gestation averages 63–65 days (range 58–70). Visible abdominal enlargement typically begins in the third to fourth week and becomes obvious by week 6.

Week-by-Week Progression

• Weeks 1–2: Fertilization, implantation. No external signs. Possible mild nausea/appetite change.
• Week 3: Embryos ~1 cm. Palpable uterine swellings ("string of pearls") by experienced vet. Nipples pink/enlarged ("pinking up").
• Week 4: Fetuses ~2.5 cm. Abdominal palpation reliable. Slight abdominal distension may be noticed.
• Week 5: Fetuses ~3.5 cm. Clear abdominal rounding. Fetal heartbeats detectable by Doppler.
• Week 6: Fetuses ~5 cm. Obvious pregnancy. Fetal movement palpable. X-ray can count skeletons (mineralized).
• Weeks 7–9: Rapid growth. Nesting behavior. Mammary development. Temperature drop (~99°F) signals labor within 24 hrs.

Confirming Pregnancy

• Palpation: Days 17–25 (vet only – risk of damage if done incorrectly).
• Ultrasound: Day 15+ (viability, heartbeats, count estimate).
• Relaxin Blood Test: Day 20–25 (placental hormone).
• X-ray: Day 45+ (accurate fetal count).

Care During Pregnancy

• Switch to kitten food (high calorie, DHA) at week 4.
• Deworm per vet protocol (some safe in pregnancy).
• Prepare quiet, warm nesting area by week 7.
• Emergency vet contact for dystocia signs: >60 min hard straining without kitten, >2 hrs between kittens, green discharge without birth.

Regular veterinary monitoring ensures a healthy queen and litter.