The RSPCA has Put out a media release warning that if you’re thinking of surrendering young kittens, and don’t actually want to kill them, you’ll need to bring the mother in too:
“Without the warmth, nourishment and grooming of the mother, kittens will quickly lose body heat and fail to thrive and become dehydrated, which in many cases mean they die or need to be humanely put to sleep to stop them suffering. Research has shown that a kitten weighing less than 90 grams has a 1% chance of survival without its mother.”
RSPCA offers cat traps to ensure both mother and kittens can be brought in. RSPCA also offers assistance to people looking after a litter of kittens in their home. We can assist with food, litter and advice. All we ask is that you keep the litter and mother until they are six to seven weeks old and then we can take over. We will ensure the mother is desexed and the kittens properly weened. We will then desex the kittens and offer them for adoption. We will also offer the mother cat for adoption is she is domesticated.
Young kittens are very susceptible to disease and the best chance they have is to remain with their mother in a dry, warm place. RSPCA can offer this, but in some cases, it is best that the litter remain where they are for the time being. This is especially true if the mother has chosen her nest as your garage, under your front porch or in your garden shed. You wouldn’t remove baby birds from a nest.