Your baby's going to be lying on them, crawling on them, and maybe even licking them--so it's key to keep your floors as clean as possible. Remove your shoes when you enter the house so you don't drag dirt, pesticides, and other pollutants inside. If your home is carpeted, consider buying a vacuum with a HEPA filter, which will get rid of the hair, dust mites, and animal dander that cling to carpet fibers. Clean wood and tile floors with a mild detergent-and-water solution and a mop. Let dry, then vacuum to get rid of any remaining dust.