Long-sleeved shirts, pants, and socks can act as natural barriers for bugs and insects. You can also choose to use mosquito netting over baby carriers and strollers.
There are also natural repellants made from different combinations of essential oils like cedar, citronella, clove, lemongrass, soybean, and peppermint. However, research has not proven these essential oil blends are effective. In addition, they can cause skin reactions for some people, so they might not be the best choice if your baby has sensitive skin. If that's the case for your child, consult your pediatrician for recommendations on bug repellents.