Working with lead is tricky because of the dust particles and fumes if it's heated. But in your home it's solid, in the paint and maybe some pipes.
Lead, like asbestos, isn't a problem if you leave it alone. At 9 months, is he chewing on window sills? Is the paint flaking or dusting off? Do you have any lead pipes in the
supply pipeing?
You should have your levels checked also, because this doesn't make sense, unless you're remodeling and putting the lead in the air.