It is difficult to determine the exact cause of the bumps on the child's body without a proper examination. There are various childhood illnesses that can present with bumps, some of which may be contagious to varying degrees. It is important to maintain basic hygiene measures and monitor the child's general condition. If their overall health remains good, there may not be a need to see a doctor immediately. Applying a fragrance-free moisturizing cream like Aveeno as needed throughout the day and avoiding rubbing the skin after a bath can help alleviate itching. If the bumps persist for more than 10 days without improvement or worsen, it would be advisable to consult a doctor for further evaluation.