On the passenger list it had Harriet HYDE being born on the ship on the way over from England. Her birth date being 17th July, 1870.
Harriet HYDE - passenger to Auckland - "Excelsior" 1870 :Aah ... now whomever transcribed this "Excelsior" passenger list
... or more importantly, whomever added the note to the list which appears online ... needs a firm smack on the hand !!

It has simply been assumed, that as Harriet HYDE was the last name appearing amongst the HYDE names listed, that this was the child born on the voyage ! AND that is INCORRECT !!
Passenger lists are compiled at the port of
departure !
Any child
born during a voyage, has his or her name (or more usually just a record of "a son/daughter born to Mrs ...") ADDED to the passenger list,
at the port of arrival !.
So, the Harriet HYDE who is recorded on the "Excelsior" list, in all probability, is the sister of Martha and Charles HYDE.(In general, the names appear on these UK to NZ passenger lists, as "Husband (or head of the family), wife ... and then children in descending order of age". Had details of "ages" been available (from the list) for all of those in this HYDE family, then it would have been much easier to have sorted this out ... earlier.

)
Lu