A kitten under 3 weeks old runs on a 4-hour clock. Miss one block of warmth or feeding and you lose a day of growth; miss two and you lose the kitten. The plan below is 8 items repeated 6 times a day, with numbers you can write down rather than guess.
Baseline targets: nest surface 29-32°C in weeks 1-2, 10-15 g of gain per day, 8-10 feeds inside the first week's blocks, and a same-day vet call if weight stalls for 24 hours.
The 8 items in one 4-hour block
Run the whole list every 4 hours, so nothing gets skipped at 3 a.m.: (1) read the thermometer lying on the bedding, (2) weigh the kitten, (3) mix formula and feed, (4) wipe the face and burp, (5) stimulate urination, (6) stimulate a stool, (7) swap the soiled pad, (8) log 6 numbers. Six blocks cover 24 hours. In weeks 1-2, two of those blocks carry 2 feeds each, which is how you reach 8-10 feeds a day.
The log has one line per block: time, nest temperature, weight in grams, share of the bottle taken as a percentage, urine yes or no, stool yes or no. Any vet you call will ask for exactly these, and no one remembers them at 4 a.m.
Warmth first: 29-32°C, checked before every feed
A newborn cannot shiver usefully until about day 10, and loses 1-2°C of body heat within 20 minutes on a bare floor. Set a heat pad under half the box only, so the kitten can crawl off it, cover with 2 layers of towel, and put the thermometer at bedding level rather than against the wall. Week 1-2 wants 29-32°C, week 3-4 wants 27-29°C, week 5 and after wants 24-26°C.
Newborn rectal temperature sits near 35.5-37.5°C and only climbs to the adult 38-39.2°C around week 4. A reading under 35°C means hypothermia: warm the kitten for 30-45 minutes first and do not feed, because a cold gut stops moving and formula sits there.
Feeding: the label sets the mix, the vet sets the plan
Use a commercial kitten milk replacer, mixed exactly as the product label states and warmed to 35-38°C, tested on your wrist. Your vet sets how much and how often for this kitten's weight; follow that rather than a number from a forum. Feed belly-down with the head slightly up, at roughly 45 degrees, and let the kitten suck for 5-10 minutes instead of squeezing a syringe.
Stop when the belly is rounded but not tight, and stop immediately if formula comes out of the nose. The feeding math walkthrough shows how a daily total gets split across 6 blocks. Discard what is left in the bottle after 1 hour at room temperature, and never microwave the bottle. Two shortcuts cause most of the disasters: diluting formula to make it last, which pushes water into the brain, and cow's milk, which brings 3 days of diarrhea.
Weight is the only honest scoreboard
Birth weight for a domestic shorthair lands between 90 and 120 g. Expect 10-15 g a day in weeks 1-2, 15-20 g a day in weeks 3-4, and a doubling of birth weight by day 7 to 10. Use the same kitchen scale at the same point in the cycle — before the first morning feed, dry kitten, no towel on the platform.
Read it as a trend, not a single number. Three flat blocks is 12 hours and worth a second look at intake and temperature. A full 24 hours without gain, or a 10% drop from birth weight, is a vet call the same day. Two gains of 25 g or more in 24 hours usually means overfeeding, not thriving.
Bathroom duty, counted rather than judged
Stimulate with a warm damp cotton pad, 10-15 light strokes over the genitals and then the anus, after every feed until about week 3. Urine should show within 30-60 seconds; a stool comes 1-2 times a day in the first fortnight and once a day after week 4.
Count what you see, because volume is the early warning for both dehydration and infection. No urine in 8 hours, or a kitten straining for 2 minutes with nothing produced, is an emergency — a male kitten can block. No stool for 48 hours needs a vet call, and 3 loose stools inside 4 hours needs one sooner. Pale grey gums, or skin that stays tented for 2 seconds when pinched, means dehydration now.
The three red lines
Line 1: rectal temperature under 35°C, or a kitten that feels cold and refuses to suck. Line 2: weight flat for 24 hours or down 10% from birth weight. Line 3: resting breathing over 60 per minute, grey or white gums, or no urine for 8 hours. Any single line means phone the vet tonight, not in the morning.
Two lines at once is an emergency room, not a phone call. Take a 15-second video before you leave: breathing rate and posture at rest are the two things a vet cannot reconstruct from your description.
Splitting the 4-week load between people
Six blocks a day for 28 days is 168 blocks, and a block with 2 feeds takes 40-50 minutes including washing. Two people splitting 3 blocks each still lose a full night's sleep every 2 days, so plan one 8-hour off-shift per person per 24 hours and hand over the log sheet, not a verbal summary.
| Age | Feeds per 24 h | Gap (hours) | Nest °C | Gain (g/day) |
|---|---|---|---|---|
| Week 1 | 8-10 | 2-3 | 29-32 | 10-15 |
| Week 2 | 6-8 | 3-4 | 29-32 | 10-15 |
| Week 3 | 5-6 | 4-5 | 27-29 | 15-20 |
| Week 4 | 4-5 | 5-6 | 27-29 | 15-20 |
| Week 5-6 | 4 | 6 | 24-26 | 15-25 |
Handling matters as much as food here. From week 2, 10 quiet minutes a day goes into the socialization window that shuts around week 7, and a kitten raised alone needs it more, not less.
Weaning starts at week 4, not week 3: warm gruel on a saucer, 2 teaspoons at a time, offered after a normal bottle so a full meal is never missed. By week 6 the kitten should take 4 meals of solid food a day, and the 4-hour block shrinks to a morning and an evening check.
Steps for tonight
- Set 6 phone alarms 4 hours apart and write the block number on each one.
- Put the thermometer, scale, log sheet and 2 clean pads in one tray beside the box.
- Fill the heat pad under half the box and confirm 29-32°C at bedding level before the first feed.
- Weigh once, write the number, and compare it to the same line yesterday, not to a breed chart.
- If you are still choosing a breed for the next kitten, the breed quiz takes 3 minutes and beats a forum thread.
- Save the vet's number and the nearest 24-hour clinic in the same contact, named so a half-asleep person can find it.
Frequently asked
Can I stretch the 4-hour blocks to 6 hours at night?
Only after week 3. A kitten in weeks 1-2 needs 8-10 feeds a day, which means a gap of 2-3 hours, and a 6-hour night gap skips 2 feeds. From week 4 the gap can reach 5-6 hours, and a single 8-hour night is reasonable from week 6 once the kitten eats 4 solid meals.
How do I know the formula is at the right strength?
Follow the ratio printed on the product label exactly and do not add extra powder to speed growth. Your vet can confirm the target volume for this kitten's weight at the first visit. Thicker formula causes constipation and dehydration, thinner formula causes diarrhea and slow gain within 24-48 hours.
What if the kitten has diarrhea for one day?
One loose stool in 24 hours is worth logging, not panicking; keep feeding and watch weight. Three loose stools in 4 hours, stool with blood or mucus, or any weight loss means a vet call the same day, because a kitten that size dehydrates in under 12 hours.