Things definitely were different a few years ago.
They are also different in other parts of the world even now - US mat leave for thousands of mothers is six weeks, and commercial childcare facilities take in babies that young. Some women go back even earlier, or work from home with a nanny doing the baby care. Often a grandparent moves in.
I have good (Russian) friends who took care of their grandchild from birth as the mother (also a good friend, I got to know her when her DD was 5) was in university when the baby was born. She graduated and got a job and apartment in the city, met and married a nice guy, bought a house together, had another baby, went to graduate school (involving the MIL spending three days and four nights per week taking care of this second baby), got her professional degree, started work, had another baby, moved out to the suburbs and closer to the grandparents with H and two babies plus nanny, and at that point, finally, at age 9 her first child joined her family.
It was very, very hard for the grandparents to transition to the changed roles. The grandmother is still very involved with all the grandchildren but feel a special bond with the oldest who was to all intents and purposes 'their baby'.
There was another daughter, also with a professional career, and the grandmother had flown off to take care of her and her family when first baby was born while she was at a crucial stage of her studies, in another city. It was at this point that I really got to know this family as I took care of the oldest grandchild during the days while the grandmother spent three months getting the other sister and her husband over the hump, so to speak. The grandfather would pick her up after work, give her dinner, go to the playground or to the pool, read together, put her to bed. This other sister and her H and baby also moved to the same suburb a few years later, and now they have three children.
Could the mother of the oldest grandchild have decided to live at home with her parents, get a job locally, and be a single mum saving up for her own place? Yes.
Did the grandparents urge her to continue with her education instead? Yes.
Did the grandparents encourage her to get that apartment in the city and enjoy the experience of working, socialising, dating? Yes.
The grandparents had hopes for their daughter and everyone was confident that the baby was secure and very much loved.
I say all this just to illustrate that sometimes circumstances can make day to day care of a baby a logistical impossibility and relationships can still be strong despite unusual care arrangements.
It's not a question of being unlovable. It's often a question of people doing their best for a baby who is loved and also doing their best for the sake of a young university student who is also loved.
I am curious in your case, OP, about how you get on with the person who took care of you as a baby, and what the trajectory of that relationship was. How do you get along with this person now, if at all?
At what point did you become aware of the existence of your mother, and were the two of you ever a household/family when you were a child?