Hi Newall60.
In answer to your question.
Mothers and babies stayed at the home for 6 weeks after DOB, the reason for this was so they could feed breast feed the babies for the first 6 weeks after birth. As far as I can tell expectant mothers only ever entered the home 6 weeks prior to the DOB. Hence the 12 weeks duration in total. As far as I can tell this was strictly adhered to.. there was no leeway in the process.
Those mothers who were returning home, trying to make a go of it on their own (extremely difficult for them to be allowed to do so, most babies were adopted) or were going to families who were supportive, took their babies with them when they left the home. Those whose babies were up for adoption, if an adoptive family had been found gave up their babies on the day of discharge or even before they left the home.
Those babies who were up for adoption but had no adoptive parents lined up went on to baby nurseries (factories) run by the Catholic church until they were eventually adopted, or were as in my case supposedly privately fostered, however I challenge that as I think babies were given away to so called foster parents as this was a way of keeping the wheels turning, as there was probably not enough potential adoptive parents for the amount of babies born. So to be clear, at 6 weeks old mother and baby were separated, as either mothers (sometimes forcibly) signed over their babies for adoption, or if they were not legally of age to do so, then a guardian or family member did it for them. All babies were by default baptised before they left the M&B home, in my case it was on the day of discharge
I have attached a template of what the register at Assisi and other institutions recorded during the mothers confinement and birth of baby. They are just the headings of what was inputted into a hand written register for each individual mother and baby in the home. I have a copy of mine which took me a long time to track down and get a copy of from the Catholic Children's Society... formerly the adoption society. I will elaborate more on what was recorded under each heading in another post. It was scant information but more than I had known before I got hold of a copy.
I am not sure if I have answered your question but hope this helps.
Best wishes
Damo