Get veterinary guidance before the first feed
An orphaned kitten needs a vet or experienced rescue involved from the start, because age, weight and condition decide everything about feeding, and very young kittens decline frighteningly fast. Have the kitten examined as soon as you possibly can, ask the vet to confirm how they want feeding handled for this kitten, and follow the instructions that come with proper kitten milk replacer rather than improvising. Never give cow's milk, which commonly causes digestive upset in kittens, and never feed a cold kitten: a chilled kitten cannot digest properly, so gentle warming, as your vet advises, always comes before the bottle, every single time.
Position matters more than speed
Feed the kitten lying on his stomach on a warm, stable surface, with his head level and slightly raised, in the posture he would use nursing from his mother. Never feed him on his back like a human baby, because milk can enter the lungs in that position, and never squeeze the bottle to speed things up; let him suckle at his own pace, with the teat full of milk so he is not swallowing air. If milk bubbles from his nose, or he coughs, splutters or goes limp, stop at once and seek veterinary help promptly, because those are signs the feed is going wrong.
Warmth, hygiene and the toilet help kittens cannot do alone
Keep everything scrupulously clean: wash hands, sterilise bottles and teats between feeds as the product guidance directs, make each feed fresh, and discard leftovers rather than reheating them. Very young kittens cannot pass urine or stools by themselves, so after each feed you must gently stimulate the area under the tail with a warm, damp cloth or cotton wool, mimicking the mother's tongue, until he toilets. Keep him in a warm, draught-free nest with a safe heat source he can move away from, because an orphan without littermates loses heat quickly between feeds and handling sessions.
A rhythm around the clock, with records
Orphaned kittens feed little and often, including through the night in the earliest stage, on the schedule your vet sets for his age and weight, and skipping night feeds is not an option a tiny kitten can absorb. Weigh him daily at the same time on kitchen scales and write it down: steady gain is the clearest sign the feeding is working, and a kitten who stops gaining, loses weight, cries constantly, feels cool, or has diarrhoea needs a vet the same day, not a wait-and-see. Keep the log where anyone helping can see it, because orphan care is a team effort by necessity.
Share the rota before exhaustion makes mistakes
Round-the-clock feeding breaks sleep for weeks, and tired carers make the errors that harm kittens, so recruit help early and make the routine so clear that a helper at three in the morning can follow it half asleep: amounts as the vet directed, position, stimulation, weighing, logging. Setting those feeding turns up in KinsLe Care Teams lets everyone sharing the orphan's care mark each feed complete with a timestamp, so no feed is ever doubled or missed by mistake.