My Dad just phoned to tell me that Toby is out of surgery and in recovery. All went as planned, so now we just wait, and hope the shunt works as it's supposed to.
The doctor who performed the surgery has implanted a LOT of these though, so I think Toby is in good hands.
Also, thankfully, Toby was able to stay healthy leading up to the surgery, and slept through his fasting period beforehand, which was a blessing. We all know how difficult it is for a baby to handle hunger!
Thank you to everyone who has had Toby in their prayers!