Hi you can apply for a visitor visa for new born and mention in the letter that you (parents) have an application in progress.
any update ircc with application # later via webform.
Also send new family information form for your application
Hi unfortunately you do not qualify for sponsorship as a conjugal partner. However, if you guys get marry then she can sponsor you. For conjugal it’s has to be much more factors than your situation. In your situation marriage is feasible.