Why daily weight records matter
Regular weighing helps you notice changes that are difficult to judge by appearance alone. Also observe feeding, warmth, activity and other signs of illness; a weight reading is one part of the assessment, not a diagnosis.
Poor weight gain can have different causes, including inadequate intake or illness. A veterinarian can help assess the cause. Keep the dated readings and your observations together so you can describe what has changed.
So the rule is simple. Weigh each kitten on the day it is born to set its baseline, then weigh at the same point in the daily routine from then on (before a feed is easiest to keep consistent). Use one scale, record to the gram, and keep every reading in the same place. An individual log makes it easier to compare readings and discuss concerns with your veterinarian.
Kitten weight chart: birth to week 12
The figures below are reference ranges, not a pass mark. A kitten sitting outside the range is not automatically in trouble, but one that sits on the bottom edge week after week, or whose curve flattens, is worth investigating.
Size bands refer to adult weight: small covers breeds maturing around 2.5–4 kg (5.5–9 lb), medium around 4–6 kg (9–13 lb), and large covers Maine Coons, Ragdolls and similar breeds that pass 6 kg (13 lb). Variation within a single litter is normal — what matters is whether each individual curve keeps climbing.
A rough rule that is easy to carry in your head: expect roughly 400–500 g (14–18 oz) per month of age early on, so about 400–500 g at one month, 0.9–1.1 kg (2.0–2.4 lb) at two months, and 1.3–1.6 kg (2.9–3.5 lb) at three months. That approximation lines up with the table.
- Week 1 — daily gain of about 10–15 g (0.35–0.5 oz); the highest-risk week, so do not skip a day of weighing.
- Week 2 — birth weight should roughly double somewhere around day 10–14; eyes open.
- Week 3 — kittens start standing and walking; a gruel or weaning formula can be introduced on veterinary advice.
- Week 4 — weaning begins and a slight slowdown in daily gain is normal.
- Week 6 — mostly eating solid food; first deworming and vaccination planning belong to your veterinarian.
- Week 8 — weaning is usually complete; expect roughly 80–120 g (2.8–4.2 oz) per week from here.
- Week 10 — activity rises sharply, so check that food intake keeps pace.
- Week 12 — close to go-home age; weight trend and general condition are both part of the pre-placement assessment.
| Age | Small breeds | Medium breeds | Large breeds |
|---|---|---|---|
| Birth (day 0) | 85–105 g (3.0–3.7 oz) | 90–120 g (3.2–4.2 oz) | 100–140 g (3.5–4.9 oz) |
| Week 1 | 150–200 g (5.3–7.1 oz) | 170–230 g (6.0–8.1 oz) | 190–260 g (6.7–9.2 oz) |
| Week 2 | 220–290 g (7.8–10.2 oz) | 250–340 g (8.8–12.0 oz) | 290–390 g (10.2–13.8 oz) |
| Week 3 | 290–380 g (10.2–13.4 oz) | 330–450 g (11.6–15.9 oz) | 390–520 g (13.8–18.3 oz) |
| Week 4 | 360–470 g (12.7–16.6 oz) | 410–560 g (14.5–19.8 oz) | 490–650 g (17.3–22.9 oz) |
| Week 6 | 500–650 g (1.1–1.4 lb) | 570–780 g (1.3–1.7 lb) | 690–910 g (1.5–2.0 lb) |
| Week 8 | 640–830 g (1.4–1.8 lb) | 730–1000 g (1.6–2.2 lb) | 890–1170 g (2.0–2.6 lb) |
| Week 10 | 780–1010 g (1.7–2.2 lb) | 890–1220 g (2.0–2.7 lb) | 1090–1430 g (2.4–3.2 lb) |
| Week 12 | 920–1200 g (2.0–2.6 lb) | 1050–1450 g (2.3–3.2 lb) | 1290–1700 g (2.8–3.7 lb) |
Three thresholds that mean act now
Do not rely on a feeling that a kitten "seems small". Use three measurable lines. If any one of them trips, intervene the same day rather than waiting to see how tomorrow looks.
First: two consecutive days with no gain. A neonate should gain visibly every day, so two flat days mean intake has not covered energy use for a while already.
Second: any drop from the previous weighing. A loss is more urgent than a stall, and a single-session drop of 8% or more against the previous reading should be treated as an emergency signal.
Third: weight falling back below birth weight. A small physiological dip in the first day or two is understandable, but a kitten that sits under its birth weight and stays there is in clear danger.
The steps below buy time; they do not replace a diagnosis. A kitten that keeps failing to gain should be assessed by a veterinarian, and any medication or feeding protocol should follow that advice.
- Warm first. A chilled kitten loses the ability to suckle, and feeding a hypothermic kitten carries an aspiration risk. Restore body and ambient temperature before you feed.
- Check the milk supply. Watch whether this kitten is being pushed off the nipple, whether the queen has milk, and whether any gland is red, hard or hot. Mastitis is a veterinary problem — do not massage or treat it yourself.
- Supplement as needed. Use a kitten milk replacer at the frequency and volume on the label. Never cow milk. Log every supplemental feed with its time and volume next to the weights.
- Separate the smallest kitten to feed. A kitten losing the nipple competition keeps losing it; feed and chart that one on its own.
- Escalate. If it still fails to gain, or if you see low body temperature, constant crying, diarrhoea or signs of dehydration, contact your veterinarian immediately instead of watching another day.
Why a kitten stops gaining: causes and clues
Failure to gain is a sign, not a diagnosis. The table below sorts the usual causes by the clue that distinguishes them, so that when you call your veterinarian you can describe what you observed rather than just "it is not growing".
| Possible cause | Typical clue | First step |
|---|---|---|
| Low milk supply or agalactia in the queen | The whole litter stalls; kittens cry and root constantly | Have the queen assessed and supplement the whole litter meanwhile |
| One kitten losing the nipple competition | Littermates gain normally; one or two curves go flat | Separate that kitten to feed and chart it individually |
| Hypothermia | Kitten feels cold, moves less, suckles weakly | Rewarm before feeding; never force-feed a chilled kitten |
| Mastitis in the queen | Queen refuses to nurse; a gland is swollen, hot or painful | Veterinary care immediately; no self-treatment |
| Congenital defect such as a cleft palate | Suckling motion but little intake, or milk back through the nose | Veterinary assessment; feeding method must be directed by the vet |
| Parasites or infection | Diarrhea, distended abdomen, dull and unresponsive | See the vet and bring a fecal sample; deworming protocol per vet |
| Environmental stress | Onset follows a move, noise, or frequent handling | Restore a quiet, dim, stable nest and minimise handling |
A weighing routine that holds up
The weighing is easy. Consistency and comparability are what break down. Same time, same scale, recorded to the gram, kept in one place — do those four and the curve becomes something you can actually read.
Paper, a spreadsheet or an app can all work. Give each kitten a fixed identifier, then keep its dated weights and units together. A chart can help you compare readings over time and see differences within a litter.
In FanMeowy Cattery Manager, keep an individual profile for each kitten and enter its actual weight against the correct record. The litter view helps you find those records together; the home weight-monitoring module shows which kittens have no weight recorded for today. Check the recorded dates and units when comparing readings. Monitoring and reminders depend on your settings and app version, and do not replace veterinary assessment.
Whatever you use, keep the records for placed kittens too. A new owner asking how their kitten grew, or a veterinarian reviewing a litter that underperformed, both need the same thing: a continuous series, not a memory.
Frequently Asked Questions
What is a normal birth weight for a kitten?
Medium breeds are usually 90–120 g (3.2–4.2 oz), small breeds around 85–105 g (3.0–3.7 oz), and large breeds such as Maine Coons and Ragdolls up to 100–140 g (3.5–4.9 oz). Variation within a litter is normal. The real use of birth weight is not comparison against a standard but as the baseline for every later judgement about that kitten, so weigh and identify each one on day zero.
How much weight should a kitten gain per day?
Roughly 10–15 g (0.35–0.5 oz) a day in the neonatal period, and a little more in large breeds. The more practical checkpoint is that birth weight should roughly double by around day 10–14. Day-to-day fluctuation is not alarming on its own, but two consecutive days without gain is.
What should I do if a newborn kitten is not gaining weight?
Work in order. Confirm warmth first, because a chilled kitten cannot suckle and should not be force-fed. Then check whether the queen has milk and whether this kitten is being pushed off the nipple. Then supplement with a kitten milk replacer and chart that kitten separately. If it still fails to gain, or you see low temperature, constant crying, diarrhoea or dehydration, consult your veterinarian without waiting.
How much weight loss in a kitten is dangerous?
Any drop from the previous weighing warrants immediate attention. A single-session loss of 8% or more against the previous reading — not against birth weight — or a weight that falls back below birth weight and stays there should be treated as an emergency and taken to a veterinarian. A loss is more urgent than a stall.
My kitten is below the chart. Is something wrong?
Not necessarily. These are reference ranges rather than a pass mark, and breed, litter size and the condition of the queen all shift them; size differences within one litter are common. What deserves concern is an abnormal trend: a flattening curve, an actual drop, or a kitten that sits on the bottom edge while gaining too little each day. A kitten slightly below range but gaining steadily usually needs no intervention.
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