To reduce your child's exposure to lead, get your child checked, have your home tested (especially if your home has paint in poor condition and was built before 1978), and fix any hazards you may have. Children's blood lead levels tend to increase rapidly from 6 to 12 months of age, and tend to peak at 18 to 24 months of age.
Since roofing shingles are brittle in winter, they may break if you handle or walk on them. This makes spring a good time to do an inspection. Look for loose or curling shingles.