Among parents and experts, the idea of giving a toddler an iPad is a fraught subject. There are some obvious drawbacks. For one thing, they’re expensive — as much as $829 for the most recent version. They’re also fragile. But the science on how the iPad affects young children isn’t yet clear, and while some experts see them as developmentally inappropriate, others see some benefits to the technology — and not just in keeping a parent’s sanity (if not guilt) in check.