Cotton is more absorbent than most synthetic fibers, so it makes a better material to use for a cloth diaper. Use a short sleeve or three-quarter-length sleeve for best results. A three-quarter length sleeve may make it easier to pin the diaper on larger babies and toddlers, but may be more material than you need for smaller babies. Choose a size based on the size of your child. An older baby or toddler may need a large or extra-large shirt, but a newborn would likely only need a small. You can do this on the floor or on any other large working surface. Lay it so the sleeves are at the top. The bottom of the shirt should be folded over about 1/3 of the way, and the seam where the sleeve meets the body of the shirt should be just below the center of the neckline. Keep the sleeve of the shirt pointed outward. This side should be identical to the fold made on the first side, so that the shirt is folded into thirds. Keep the sleeve pointed outwards. At this point, you should be left with a "t" or cross shape. Bring the part of the t-shirt extending above the sleeves down over the sleeves. The upper part of the lowercase "t" shape should be folded all the way over, creating a capital "T" shape. Take the bottom portion of the shirt and draw it up to the bottom sleeve line. Essentially, you are making a fold that shortens the length of the shirt by half. You will still have a capital "T" shape, but it will be a shorter "T." A waterproof diaper cover is essential for preventing leaks. If you have one, add a diaper cover to increase the absorbency of the diaper. The fabric for these types of diapers are thin so they get soaked pretty quickly, and you need to plan to change them frequently.
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One-sentence summary -- Use a shirt that is 100% cotton. Lay the shirt flat. Fold one side of the shirt over. Fold the other side of the shirt over. Fold the top of the shirt down. Fold the bottom of the shirt in half. Place a diaper cover over the diaper.

Your goal is to keep the pollen that is outside, outside. Keep your car windows and house windows closed and use air conditioning instead, especially when the pollen count is high or you're in the midst of pollen season. Unfortunately, this comes at an additional financial cost, so decide how often you want to use this method. Alternatively, have a new and efficient air filter added to the air intake of your car, so that you can use outside air to circulate around the car instead of air conditioning. If you don't have air conditioning in your home, it may help to swap bedrooms with a housemate whose room faces the fewest allergy-producing trees and plants. It will help to reduce the exposure when you let fresh air into your room. Pollen collects on your skin and clothes when you're outside, so when you get home remove your day clothes immediately and toss them in the hamper or washing machine. This will prevent the spread of hitchhiking pollen to the couch, your bed, and other clothes. Wash your clothes before wearing them again. Use an electric dryer or indoor clothes line instead of drying your laundry outdoors. You may also want to leave your shoes at the door after spending time outside to avoid tracking pollen indoors. Pollen not only settles on your clothes throughout the day, but also on your skin and in your hair. Going to bed with pollen in your hair will transfer that pollen to your pillow, and you'll sleep with your face in pollen all night long. A soap-free rinse in the shower before bed will do the trick to remove pollen from your skin, but for the best defense overnight wash your hair, as well. Sheets, blankets, comforters, and especially pillowcases should be changed often, at least on a weekly basis if not twice per week. Thoroughly wash bedding before reusing. Have spare sets of bedding so you can swap the sets out often without overwhelming yourself with doing laundry every three days. Keeping a clean, pollen-free bed will protect you from inhaling pollen all night long. Your dog, outdoors cat, rabbit, ferret, or other loveable pet can easily track pollen into the house. Commit to brushing them daily to remove as many allergens as possible from their fur, especially if they sleep in bed with you. Groom them in a wood or tiled area so that you can easily clean up without hair and pollen getting into the carpet. No amount of washing and prevention will stop all pollen from entering your home. Vacuum at least once a week to help remove the residual pollen that's carried inside on people and pets. Use a vacuum cleaner with a small-particle or HEPA filter.
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One-sentence summary --
Close your windows. Change your clothes promptly at the end of the day. Wash your hair before going to bed. Change your bedding often. Groom your pets regularly. Vacuum every week.