For severely neglected children such as the 3-year-old and a 5-month-old kept hidden, and in isolation, in a house in Blackstone rescue from parents unwilling or unable to provide for the most basic needs is only the beginning of a recovery process. It can take years if it happens at all, experts on child development say, to reverse years of isolation and neglect. Charles Nelson, professor of pediatrics at Boston Children’s Hospital, is quoted.