I think there's some posters here who come from very sad and unfeeling families OP, or maybe we're the exception to the rule because whenever myself and my sibling have been in hospital either planned or unplanned, our parents, other family members and friends have always brought a treat in, or something non edible to cheer us up, unprompted, in addition to the 'do you need anything practical' list.
Previously this may have been a magazine or I even had a photo of the family pet brought in at one point!
In turn, I have had a few friends end up in hospital and have done the same and would do for anyone.
When both my children were born, friends and family arrived with treats and gifts and practical assistance whilst still in hospital.
To be honest, I learnt that kindness and generosity from a young age from my parents.
Threads like this, and their responses from other posters only serve to remind me how unfortunate some people are to have zero support and how fortunate I am to have such generous, kind and supportive family members and friends, of which we seem to be in the minority, sadly!
So no I don't think you're unreasonable but equally if this behaviour isn't modelled by you in respect to your child, or you never witnessed it from your step parent then I'm not surprised they haven't bothered.