Baby Brown First Appearance Date?

"Sweepstake" at work, trying to predicate the date of birth

6th - Seg
7th - Ewan
8th - Rob
9th - Dean
10th - Keith
11th - Allan
12th - Vicks
13th - Andrew
14th - Buster
15th
16th - Kev
17th
18th - Grzegorz
19th
20th
21st
22nd - Jason
23rd - Ian