Hi Kellie,

The name of the lady who was engaged to Jack was Eliza.
Her baby Beryl May was born in February 1917.

Re... "VIC Births are available to 1920. No release needed.
There is a birth record."

I checked Vic BDM's website, for:
Surname: *
Given Name: Beryl
Birth
Year: 1917

and there were no records.

There were 11 babies named May, in 1917.
No baby registered in 1917, as HARRIS, mother, Eliza.
No baby registered in 1917, as V*, mother, Eliza.
No baby registered in 1917, as *, mother HARRIS Eliza.

In 1916, four babies were registered as Beryl.
In 1917, zero babies were registered as Beryl.
In 1918, zero babies were registered as Beryl.
In 1919, five babies were registered as Beryl.

Mary