Recursive query which aggregates child items in sqlite3

Question

I have a table of parent-child relationships:

CREATE TABLE item_parent(item_hash, parent_hash);
CREATE UNIQUE INDEX item_parent_unique ON item_parent(item_hash, parent_hash);
CREATE VIEW item_timestamp AS SELECT item_hash, item_timestamp FROM [...]

I would like to create a view which aggregates these into the following columns:

item_hash (from the table)
child_count (recursively summarized)
newest_timestamp (joined from item_timestamp, most recent timestamp of all the items which are in the tree)

I understand I'm supposed to do something with WITH RECURSIVE, but having trouble figuring out the syntax. I've looked around SO already.