Meh…. Idk babies, toddlers, children all have expectations, many of them unreasonable.
Not saying nurture doesn’t give them different ones or modify existing ones, but I find it highly suspect and in direct contradiction of my empirical experience to assert that children aren’t born with expectations.
Having three, I still think that the tabula rasa might be the proper was to look at it. The expectations of infants follow from their interactions with the world. And those are firstly the interactions with their parents and family. Outside of the very basic needs (food, drink, emotional comfort) you get the children you make. Not to say that all children react the same way to the same parenting, or have the same expectations. But you do mostly create their value system that governs their expectations.
They are raised to believe in "one right way".
Over time they learn it is just one of many, and much of the "value system" they were raised on is bullshit.
If they move past this, they can focus on enjoying the rest of their lives.