Hi Sharon,
I was just looking at the two records for baptism in Rotterdam that I have for Ariaantje.
The first is for 25 December 1670 -https://www.familysearch.org/ark:/61903/3:1:3QS7-L9QV-W9WD-8?i=964
The father is Jacob Abrahamse but the mother's name does not look anything like a 'Heiltjie' - the name appears to start with a B.
Then there is this one - https://www.familysearch.org/ark:/61903/3:1:3QS7-99QV-M4MC?i=119
The child's name is Adriana, and the father is Jacob Abrahamse. The mother's name appears to be Heyltie on this one.
Any idea on which is most likely to be the relevant one?
Just wading in... what I can read:
First parents: Jacob Abramse and Hilletje Ariaens
Second parents: Jacob Abramse and Heijltje Adryens
So in my humble opinion both parents could be right. Stronger, there is a change that these are the same parents and it was just different people writing the baptisms down, each chosing their own spellings. Names weren't that fixed at all at that time in The Netherlands. Also most people couldn't read, so couldn't say that their name was written wrong anyway.
If it is the same parents then the first child probably died young, before the second was born. This is also descriped this way "[S377] Webpage South Africa's Stamouers (http://www.stamouers.com/) "Adriana Jacobs, dogter van Jacob Abrahamse en Heiltje Arijens, is gedoop te Rotterdam in Nederland op 25 Mei 1673. Haar ouer suster Ariaentje wat vroeer algemeen aangegee is as ons stammoeder, sterf op 2-jarige ouderdom en word op 16 November 1672 te Rotterdam begrawe. [Johan van Deventer]" " on https://www.e-family.co.za/ffy/g5/p5308.htm (webpage quoted in About).
Just my two pennies.
Also read that on Stamouers Hubert and was going to comment.
I have a Dutch website with records on it where I have found baptism originals and transcriptions for Arianetje and Adriana (same as what I posted from familysearch above - the transcriptions give Jacob and Heijltje as parents to both), as well as two other children - Elsien and Abram. Will load them later. Also found Jacob and Heijltje's marriage registration. Working my way through the site trying to find any death / burial records for Ariaentje.