Queening Box: Temperature and Humidity by Week

Three numbers run a queening box: 27 to 29 C in the room during labor, 30 to 32 C at litter level for the first 7 days, and 50 to 60 percent humidity. A fourth rule decides whether those numbers work at all: the heat pad covers 1/3 of the floor and no more. Get those 4 right and most hypothermia, dehydration and fading-kitten calls never happen.

Where to measure, and with what

Measure at litter level, 5 cm above the bedding, not at the wall. Use 2 thermometers, 1 digital probe and 1 backup, plus 1 hygrometer, and log 3 readings a day for the first 2 weeks. Room air stays at 24 to 26 C; the nest adds 4 to 6 C on top. During labor the room runs cooler, 27 to 29 C, because a queen pants and overheats above 29, then rises to 30 to 32 C once the last kitten is dry.

The kitten's own temperature is the real target

A newborn's rectal temperature is 35.5 to 37.2 C at birth and reaches 37.5 to 38.5 C by 4 weeks; the adult range is 38.1 to 39.2 C. Below 35.0 C is hypothermia, and a cold kitten stops digesting: never feed one, warm it at 1 C per hour first. Above 39.5 C in a neonate points to infection or an overheated nest, and the 2 look different within 30 minutes of moving the kitten off the pad.

The week-by-week settings

Age	Nest C	Humidity %	Heat source	Checks/day
Day 0 to 7	30 to 32	55 to 60	Pad on 1/3, towel over	4
Day 8 to 14	28 to 30	50 to 60	Pad on 1/3	3
Week 3 to 4	26 to 28	50 to 55	Pad off, ambient	2
Week 5 to 6	24 to 26	45 to 55	None	1

Drop 1 to 2 C per week after day 14, never more than 2 C in 24 hours. A litter that spreads to the edges of the box is too warm; one piled in 1 corner is too cold. The box itself wants 60 by 60 cm and a 10 to 12 cm lip, which is the setup covered in whelping box setup.

Why the pad covers only 1/3

A kitten cannot regulate its own heat until about 3 weeks and moves toward warmth in 1 to 2 cm steps. If the pad covers 100 percent of the floor, a kitten that is too hot has 0 cm of escape and dehydrates in 6 to 12 hours. One third of the floor gives a 33 percent warm zone and a 67 percent neutral zone. Keep the pad surface at 38 C or below and always put a towel between pad and kitten, so direct contact stays under 40 C.

Build the gradient along the long axis: pad at 1 end, bare bedding at the other, water bowl at the cool end, nest entrance at the warm end. A 60 cm box then gives 20 cm of heat and 40 cm of neutral floor. Run your wrist over 3 spots before each feeding; if all 3 feel the same, the pad is too large or the room is too warm, and the 2 in the middle will be the ones that stop gaining weight.

The queen has her own range

A nursing queen is comfortable at 24 to 26 C and will leave a box that sits above 27 C, then lie on cool tile for 20 minutes. If she abandons the nest more than 3 times in an hour, the box is too hot, not the kittens. After week 4 the whole group can go to 24 to 26 C, which is also the point where a heating pad turns from help into a burn risk for a kitten that cannot walk away.

Overheating looks like dehydration

An overheated kitten sprawls flat away from the litter, pants above 60 breaths a minute, and shows hot red ears. Check skin turgor at the scruff: over 2 seconds is dehydration, and dark concentrated urine in the first 48 hours confirms it. Weight loss above 10 percent of birth weight in 24 hours is the number that sends you to the vet. A chilled kitten does the opposite: huddles, has cool paws, a temperature under 35 C, a weak cry and no interest in suckling.

Humidity, bedding, and airflow

50 to 60 percent keeps airways moist; under 40 percent dries mucus and crusts nostrils within 24 hours; over 70 percent grows mold and bacteria in bedding inside 48 hours. Change bedding daily for the first 7 days, then every 2 days. Put the hygrometer 5 cm above the bedding, keep a shallow water bowl near but outside the box, and never point a fan or vent at the nest. Airing the room 10 minutes twice a day with the kittens in a warm box is enough.

Power cuts and 4 checks that catch trouble

For an outage, keep 2 hot water bottles at 40 C, wrapped in towels, and swap 1 every 90 minutes; a 1 kg kitten in a 20 C room loses heat fast. Check 4 things every 4 hours for the first 48 hours: nest temperature, each kitten's weight in grams, whether all are suckling, and bedding dryness. After day 7, check every 6 hours. A kitten that loses weight 2 checks in a row is a supplement decision, and this kitten weight tool does the percent math.

When to call the vet

Call the same day for a kitten temperature under 35 C, weight loss over 10 percent in 24 hours, no gain for 24 hours, panting above 60 breaths a minute, or a queen temperature over 39.5 C. Call immediately for a kitten that feels cold and will not suck, for brown or green discharge, or for a queen that is restless and trembling 1 to 3 weeks after birth, which is a calcium problem and not a nest problem.

The 5-minute daily routine

• Read the nest thermometer and hygrometer at the same 3 times each day and write both numbers down.
• Weigh every kitten at the same hour on a 1 g scale and note the change, not just the value.
• Feel 2 paws and 1 belly per kitten to check for cold or overheating before it shows on the thermometer.
• Check that the pad covers only 1/3 of the floor and that the towel is dry.
• Replace damp bedding at once, and record any kitten that was outside the nest for more than 10 minutes.

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