Domestic cats have four pairs of mammary glands arranged in two parallel rows along the underside, running from the chest to the groin: cranial thoracic, caudal thoracic, cranial abdominal, and caudal abdominal. Not all teats are equally productive — the caudal (rear) pairs typically yield more milk.
Within hours of birth, each kitten establishes a preferred teat it returns to for most nursing bouts — a behavior called teat-order fidelity. This reduces competition within the litter and ensures consistent milk delivery. Kittens recognize their teat by scent.
Kittens knead the mammary tissue with alternating forepaws to stimulate oxytocin release and milk letdown. This instinct persists into adulthood as a comfort behavior. Milk does not flow freely — it requires active stimulation from nursing.
In the first 24–48 hours, queens produce colostrum rich in maternal immunoglobulins (IgG, IgA). Neonatal kittens can absorb these antibodies through the gut wall — a window that closes after roughly 16 hours, making early nursing critical for passive immunity.
Richer and creamier than cow's milk with a subtle sweetness. The high protein content — roughly 3× that of cow's milk — gives it a thicker texture. Pale ivory in color. Notably high in taurine, an amino acid essential for cats that humans can synthesize but cats cannot.
Cat milk is unusually high in protein relative to fat, reflecting the obligate carnivore ancestry. Taurine content is among the highest of any mammal's milk and is critical for kitten retinal and cardiac development. Not suitable as a substitute for kittens requiring hand-rearing — commercial kitten milk replacer is formulated to match.
High in calcium and phosphorus for rapid skeletal growth. Rich in fat-soluble vitamins A, D, and E. Lactoferrin content provides antimicrobial protection in the first weeks before the immune system matures. Colostrum IgG levels are roughly 5–10× higher than in mature milk.
Unlike ruminants, cat milk composition changes dramatically over the ~8-week lactation period — fat and protein peak around weeks 3–4 as the queen's body condition declines, then both drop as weaning approaches. Total daily yield is modest (~100–200 mL across all eight teats), but energy density compensates for small volume.