Starting your infant with rice cereal at 4 months is not the best option.
Parents are often told that rice is “less allergenic” and therefore to start offering this to your baby first. But there really is no need for processed grains for a baby. And you probably want to wait until closer to 6 months of age. It is best to start with a mild vegetable, most palatable are often in the yellow family, like carrots, squash or sweet potatoes. You can advance with other green vegetables or avocado, and then move onto fruits.