1) Keep the litter box clean. This is the most important thing you can do to help reduce the smell. Make sure to scoop the litter box at least once a day, and more often if possible. You should also use a clumping litter that will help to absorb the urine and prevent it from sticking to the bottom of the box.
2) Wash the kitten's genitals. You can do this with a warm, damp cloth. Be sure to be gentle, and avoid using any harsh chemicals or soaps.
3) Use a pheromone spray. There are a number of pheromone sprays available on the market that can help to calm cats and reduce their stress levels. These sprays can also help to mask the smell of heat.
4) Keep the kitten indoors. If you let your kitten outdoors, it is more likely to come into contact with other cats and contract diseases. It is also more likely to get lost or injured.
5) Spay your kitten. Spaying is the most effective way to prevent your kitten from going into heat. It is a surgical procedure that removes the kitten's ovaries and uterus. Spaying will also help to prevent your kitten from developing uterine cancer or pyometra, which is a serious infection of the uterus.