Kitten Growth Calculator

Pediatric Feline Auxology, Growth Velocity Curves, and Weaning Developmental Phases

Feline pediatric auxology—the scientific study of physical growth and maturation—tracks the rapid transformation of newborn altricial kittens into physiologically mature young adults. A kitten's growth velocity is fastest during the first 16 weeks of life, during which body mass increases by over 1,000%.

Under pediatric veterinary protocols from the American Association of Feline Practitioners (AAFP) and the WSAVA:

Standard Feline Growth Phases & Developmental Milestones:
- Neonatal Phase (Weeks 0–2): Birth weight 90–110g; double weight by Day 10; eyes open at 10–14 days
- Transitional Phase (Weeks 3–4): Deciduous baby incisors erupt; voluntary elimination emerges; weaning gruel introduced
- Socialization & Weaning Phase (Weeks 4–8): Rapid play motor coordination; fully weaned onto solid kitten food at 8 weeks (≈ 2.0 lbs)
- Juvenile Growth Phase (Weeks 9–24): Steady linear growth of ≈ 1.0 lb per month; adult teeth erupt at 4–6 months
- Skeletal Consolidation Phase (Months 6–12): Growth plates (epiphyses) close; adult body mass stabilizes

Caloric Conversion & Nutritional Density

Kittens possess immature digestive tracts and high metabolic rates. They require 30% to 40% crude protein, high dietary fat, and essential Docosahexaenoic Acid (DHA) to fuel rapid neuro-retinal development. Feeding adult maintenance food to kittens causes stunted growth and metabolic bone disease.

Calculate exact kitten food portions with Cat Food Calculator, monitor body condition via Cat BMI Calculator, plan play socialization using Cat Play Time Calculator, and explore pediatric standards at AAFP.