Cacatua alba is the Latin name for the umbrella cockatoo. I can't find too much information but I did find a little. The table on page 818 of this link shows a partial weight chart for umbrella cockatoo chicks:
http://avianmedicine.net/content/uploads/2013/03/30.pdfThis link doesn't have information on the umbrella cockatoo:
http://recil.grupolusofona.pt/bitstream ... sequence=1 But it does have growth curves for several parrot species including a couple of cockatoos. You might be able to find a species that has a weight similar to the umbrella cockatoo, and use it as a guide. The link also has daily weight charts at the very end of the paper that have more details.
Good luck, I hope this helps!