I researched back a few years to see what I wrote when Molly was born. At the time there was a news story, and website, indicating that the world's 7 billionth person was going to be born in a matter of weeks. I guess it was weeks. Low and behold the website is still live and pumping out numbers at alarming rates.
The numbers for Wally show he is the 7,246,419,973rd person currently on earth, and overall, the 83,648,877,411th person to have lived since history began. Check it out for yourself if you like at http://www.bbc.co.uk/news/world-15391515.
Even if the website has a margin of error between 3 and 6 per cent, that is still a heck of a lot of people.
Wally is doing just fine, still. All of the grandparents have been over. Nothing else really.