Growth & Weight Guide

Sphynx Growth Chart — Weight by Age & Size Guide

Updated April 202610 min readVet-reviewed sources

How much should your Sphynx weigh at each age? When do they stop growing? This guide covers month-by-month weight ranges for both male and female Sphynxs, growth milestones, when growth plates close (and why that matters for exercise), feeding guidelines by stage, and the warning signs that something might be off — all backed by veterinary research including population-level data from over 6 million dogs.

Adult Weight♂ 8-12 lbs (4-5 kg)
♀ 6-10 lbs (3-5 kg)

Adult Height♂ 8-12 in
♀ 7-10 in

Full GrownHeight: 10-12 months
Weight: 12-16 months

Size Categorymedium
12-15 years

Sphynx Weight Chart by Age

Weight ranges shown are for healthy Sphynxs at ideal body condition. Your cat should fall within these ranges — being slightly below the range is better than above for long-term joint health.

♂ Male Sphynx Weight

Age	Weight (lbs)	Weight (kg)	Notes
Birth	3-3 oz	0.1-0.1	Born blind and deaf
1 month	10-13 oz	0.3-0.4
2 months	1.3-1.9	0.6-0.9	Typical adoption age
3 months	2.2-3.4	1.0-1.5
4 months	3.4-5.0	1.5-2.3
5 months	4.4-6.6	2.0-3.0
6 months	5.4-8.0	2.4-3.6
8 months	6.6-9.8	3.0-4.4
10 months	7.4-11.0	3.4-5.0
12 months	7.8-11.6	3.5-5.3
16 months	8.0-12.0	3.6-5.4	Fully mature

♀ Female Sphynx Weight

Age	Weight (lbs)	Weight (kg)	Notes
Birth	3-3 oz	0.1-0.1	Born blind and deaf
1 month	8-10 oz	0.2-0.3
2 months	1-1.5	0.5-0.7	Typical adoption age
3 months	1.8-2.7	0.8-1.2
4 months	2.7-4.0	1.2-1.8
5 months	3.5-5.3	1.6-2.4
6 months	4.3-6.4	2.0-2.9
8 months	5.3-7.8	2.4-3.5
10 months	5.9-8.8	2.7-4.0
12 months	6.2-9.3	2.8-4.2
16 months	6.4-9.6	2.9-4.4	Fully mature

Sphynx Growth Milestones

7-14 days

Eyes open

Initially blue, adult color develops by 6-8 weeks

14-21 days

Ears open

Hearing develops gradually

3-6 weeks

Baby teeth erupt

26 deciduous teeth

6-8 weeks

Fully weaned

Eating kitten food exclusively

3-4 months

Permanent teeth start

30 adult teeth by 6-7 months

5-9 months

Sexual maturity

Females can go into heat as early as 5 months

12-14 months

Growth plates close

Skeletal maturity reached

12-16 months

Full physical maturity

Final weight and body condition reached

Growth Concerns for Sphynxs

Obesity is the biggest growth risk for cats

61% of cats are overweight or obese (APOP 2022). Indoor cats are especially at risk. Excess weight during growth sets the stage for lifelong obesity, diabetes, and joint disease.

Feed measured meals — never free-feed kittens after 6 months. Use the weight chart to track monthly. You should feel ribs easily.

Rapid growth in kittens can mask parasites

Kittens should gain approximately 100g (3.5 oz) per week from birth to 5-6 months. If growth stalls or a kitten has a pot belly despite being thin, intestinal parasites (roundworms, hookworms) are the most common cause.

Follow your vet's deworming schedule. Bring a stool sample to kitten wellness visits.

Feeding Guide by Growth Stage

Stage	Meals/Day	Food Type	Amount
8-12 weeks	4x	Kitten formula	Free-feed or 4 measured meals/day. Kittens this age rarely overeat.
3-6 months	3x	Kitten formula	Rapid growth — high calorie needs. 3 meals/day.
6-16 months	2x	Kitten formula	Growth slowing. Switch to measured meals to prevent obesity.
12-16 months+	2x	Adult cat food	Transition gradually over 7-10 days. Indoor cats need ~20 kcal/lb/day.

See our full Sphynx Diet & Nutrition Guide for detailed caloric needs, macros, and breed-specific dietary risks.

Exercise Guide by Growth Stage

0-3 months

Free play with toys

Kittens are naturally active. Provide climbing, scratching, and interactive toys. Short play sessions throughout the day.

3-6 months

Active play 15-20 min 2-3x daily

Peak energy period. Interactive toys (feather wands, laser pointers with treat finish) build coordination and muscle.

6-12 months

Structured play sessions

Maintain daily play. Indoor cats need enrichment — cat trees, window perches, puzzle feeders.

12+ months

Daily enrichment

Adult cats need 15-30 minutes of active play daily to maintain healthy weight. Indoor cats are especially prone to sedentary obesity.

When to Worry — Growth Red Flags

Not gaining weight for 2+ weeks (under 6 months)

Kittens should gain steadily. Stalled growth may indicate parasites, FeLV/FIV, or nutritional deficiency. Vet check needed.

Pot belly with thin body

Classic sign of intestinal parasites. Vet visit for deworming and stool analysis.

Lethargy or not eating for 24+ hours

Kittens should be active and eager eaters. Appetite loss is a red flag — can indicate illness or hepatic lipidosis risk in older kittens.

Limping or difficulty jumping

May indicate injury, developmental issue, or rarely nutritional deficiency. Vet exam recommended.

Weight exceeding chart range by 20%+

Reduce food and increase play. Obesity in young cats creates lifelong weight problems.

Frequently Asked Questions

Sphynxs reach adult height by approximately 10-12 months, but reach full weight by 12-16 months. Males typically reach 8-12 lbs, females 6-10 lbs.

Males typically reach 8-12 lbs and females 6-10 lbs at maturity. Most Sphynxs are near adult size by 12 months. Genetics, diet, and neuter status all affect final size.

Compare to the growth chart above. Kittens should gain about 100g (3.5 oz) per week until 5-6 months. More important than the number: you should feel ribs with light pressure. If you can't, reduce food portions.

A high-quality kitten formula. Kittens need higher protein and calories than adult cats. Feed 3-4 meals/day until 6 months, then 2 measured meals. Switch to adult food when growth plateaus (around 12-16 months).

Early spay/neuter delays growth plate closure, resulting in slightly taller cats. However, neutered cats have 20-30% lower energy needs and significantly higher obesity risk. Monitor food intake closely after neutering.

When growth plateaus — typically around 12-16 months for Sphynxs. Most cats switch at 10-12 months. Transition gradually over 7-10 days.

The rib test: you should feel ribs without pressing hard. View from above: a visible waist between ribs and hips. 61% of cats are overweight (APOP 2022) — regular monitoring prevents problems.

Sources

AKC/TICA Breed Standard — Sphynx — official weight ranges (2024)

APOP — Association for Pet Obesity Prevention — 61% of cats overweight (2022)

Root Kustritz MV — Effects of spay/neuter on growth plate closure — JAVMA (2007)

Merck Veterinary Manual — Feline growth and development — kitten weight milestones (2023)

Growing Sphynxs face real health risks

Health conditions that develop during growth can be expensive to treat. Pet insurance covers hereditary and congenital conditions when diagnosed after enrollment.

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