The Selkirk Rex is celebrated for its sturdy, heavy-boned cat with thick plush teddy-bear curls like a woolly lamb. Whether you are welcoming a young kitten into your home or monitoring an adolescent growth spurt, tracking month-by-month physical milestones ensures your companion develops on a healthy, balanced trajectory.
💡 Development Note: For general week-by-week weight targets during early kitten development, compare your milestones with our normal kitten weight gain by week guide.
📋 In This Guide
Selkirk Rex Weight Chart by Month#
Quick Answer: Healthy adult Selkirk Rex cats typically reach full physical maturity between 18 and 24 months (around 2 years), with an overall adult weight range of 8.0 - 16.0 lbs (3.6 - 7.3 kg). Adult males average 11.0 - 16.0 lbs (5.0 - 7.3 kg), while adult females are slightly lighter at 8.0 - 12.0 lbs (3.6 - 5.4 kg).
Below is a month-by-month guideline for male and female Selkirk Rex kittens from early weaning through adult maturity.
| Age | Male Weight Range | Female Weight Range | Physical & Developmental Milestones |
|---|---|---|---|
| 8 Weeks (2 Months) | 1.8 - 2.7 lbs (0.8 - 1.2 kg) | 1.5 - 2.2 lbs (0.7 - 1.0 kg) | Tight kitten ringlets; curly whiskers and soft down |
| 12 Weeks (3 Months) | 3.0 - 4.2 lbs (1.4 - 1.9 kg) | 2.5 - 3.5 lbs (1.1 - 1.6 kg) | Curls may loosen slightly during baby fur molt |
| 16 Weeks (4 Months) | 4.2 - 5.8 lbs (1.9 - 2.6 kg) | 3.5 - 4.8 lbs (1.6 - 2.2 kg) | Heavy cobby bone structure widens; plush body fill |
| 6 Months | 6.2 - 8.5 lbs (2.8 - 3.9 kg) | 5.0 - 7.0 lbs (2.3 - 3.2 kg) | Dense woolly adult curls emerge in loose bunches |
| 9 Months | 8.0 - 11.5 lbs (3.6 - 5.2 kg) | 6.5 - 9.0 lbs (2.9 - 4.1 kg) | Round cheeks broaden; patient and affectionate personality |
| 12 Months (1 Year) | 10.0 - 14.0 lbs (4.5 - 6.4 kg) | 7.5 - 10.5 lbs (3.4 - 4.8 kg) | Baseline adult frame reached; heavy solid torso |
| 2 Years (Full Adult) | 11.0 - 16.0 lbs (5.0 - 7.3 kg) | 8.0 - 12.0 lbs (3.6 - 5.4 kg) | Full mature sheep-like curl density and cobby power |
The ‘Cat in Sheep’s Clothing’#
Unlike the delicate Devon and Cornish Rexes, the Selkirk Rex is a large, heavy-boned breed created by crossing domestic cats and Persians with a dominant curly gene, giving them rich woolly ringlets.
Healthy Body Condition Scoring for Growing Kittens#
Because individual genetics, frame size, and bloodlines cause natural variations in weight, hands-on body condition checks are the best way to evaluate healthy growth:
- The Rib Feel: You should easily feel your kitten’s ribs beneath a light layer of tissue without applying firm pressure.
- Waist Contour: Looking down from above, there should be a gentle, visible taper behind the ribcage before the hips begin.
- Abdominal Tuck: When viewed from the side, the lower stomach should slope cleanly upward toward the hindquarters.
Feeding & Nutrition Guidelines#
- High-Quality Protein First: Choose kitten recipes that list named real meats (such as chicken, turkey, or salmon) as the first ingredient to build sturdy muscle tone.
- Support Proper Hydration: Offer wet canned food daily alongside clean, fresh water fountains to promote lifelong urinary tract and kidney health.
- Portion Calibration: Avoid leaving massive bowls of dry food out at all times once your kitten approaches adolescence to prevent excess fat accumulation.
