"His accelerated growth, the one Celesca told us about," Harry went on. "The boy has been unnaturally aged by magic. He may look four or five, but I think he’s only about seven or eight months old at most. And the acceleration process has destabilised his biology. His heart, lungs, all bodily systems are under massive strain. They can’t keep up with the rapid development of his physical body, which seems to have been manipulated in periodic growth spurts."