This was a very important birth within the population of North American Masai giraffes. Mstari was the number one most valuable female genetically (as far as I can tell, she still is) and I believe Kiko was number three or four. Add to that the fact that the new baby is a third-generation Toronto Zoo kid (her mom, Mstari, and grandma, Twiga, were each born in Toronto as well) and you have a very highly anticipated event.
From the very beginning, Kiko hit it off with Mstari (and Twiga) which is terrific news, because their genes are very important to the North American breeding program (known as the SSP: Species Survival Plan). Any offspring they produce will be very important to the future success of the Masai species in AZA-accredited Zoos.