The juvenile period for an Aegean cat spans roughly from eight weeks to twelve months of age, a stretch of rapid physical transformation during which the kitten's body approaches its adult proportions. Aegeans are a medium-sized breed, and most individuals reach their full skeletal frame by ten to twelve months, though muscle mass and coat density may continue to fill in for several months beyond that. Males tend to be slightly larger than females, typically finishing between nine and twelve pounds, while females settle between seven and ten pounds.
Growth during this period is not perfectly linear. Aegean kittens often experience noticeable growth spurts interspersed with brief plateaus, and their appetite will fluctuate accordingly. A kitten that seems ravenous one week and comparatively disinterested in food the next is usually responding to its body's changing energy demands rather than signaling a health problem. Consistent monitoring of body condition — feeling the ribs and observing the waistline from above — is more informative than fixating on exact weight targets.
The Aegean's semi-longhaired coat undergoes significant changes during the juvenile months. Kittens are born with a relatively fine, soft coat that gradually gives way to the denser, more textured adult fur. The bicolor or tricolor patterns that define the breed become more clearly delineated as the kitten matures, and the characteristic white patches with color markings sharpen in contrast. Seasonal coat changes may also begin to appear toward the end of the first year, reflecting the breed's adaptation to the Mediterranean climate with its warm summers and cool, damp winters.
Skeletal development during this stage means that an Aegean kitten's joints and growth plates remain vulnerable to injury from excessive jumping or rough play on hard surfaces. While the breed is naturally athletic and sure-footed — traits refined through generations of island living — caution is warranted with very high cat trees or unsupervised access to tall furniture until the kitten is closer to eight or nine months old and the long bones have reached near-adult density.