Parents can take several steps to minimize their child's exposure to environmental toxins: 1. Use lead-free paint and ensure homes are free from old, peeling paint. 2. Provide a diet rich in organic produce to reduce pesticide intake. 3. Use air purifiers and avoid areas with high traffic pollution. 4. Opt for BPA-free and phthalate-free products. 5. Limit consumption of fish known to have high mercury levels.