The Royal Society for the Prevention of Cruelty to Animals (RSPCA) is appealing to would-be pet owners after finding two kittens that were left to die.
The kittens, named George and Elton and both a few weeks old, were barely alive.
Now the charity is hoping to encourage people to adopt kittens rather than buy them.
Since coming to RSPCA Putney Animal Hospital, RSPCA vet nurse Katrina Devita has been hand-rearing them at home because a hospital environment can be stressful for such young animals.
Sian Anderson, a clinical manager at RSPCA Putney Animal Hospital, said: “Unfortunately these two naughty boys have a habit of suckling each other in their sleep and making themselves sore.
“Our nurse came up with these fabulous outfits to help stop the habit. They are made from baby socks as they really are that small. They are very happy and not affected by them.”
George and Elton will be available for rehoming in around a month, once they are fully weaned. They will have to be rehomed together as they are so close.
Ms Anderson said: “We are seeing such a high number of kittens coming into our care, and we would like to urge people to remember to get their cats neutered to try to avoid unwanted litters of kittens. Hand-rearing is so time intensive and our staff are overwhelmed by the sheer number of cats and kittens that need our help.”