Final answer:
Loratadine, Cetirizine, and Fexofenadine are non-sedating antihistamines commonly used for children to treat mild allergy symptoms without causing drowsiness, and all of the mentioned options (1, 2, and 3) are correct.
Step-by-step explanation:
The non-sedating antihistamines used for children to treat mild allergy symptoms include Loratadine, Cetirizine, and Fexofenadine. These antihistamines are designed to reduce or eliminate the effects of histamines, which cause symptoms like nasal congestion, sneezing, and hives without causing drowsiness.
While they are available over-the-counter and are generally safe for short-term use, it's important for consultation with a medical professional for long-term use of antihistamines, especially in children, to avoid the risk of complications such as asthma or sinusitis.