Best to check with the hospital ... each may have their own specs as to what they like and don't like.
Bonus ... there may be a local guild who have adopted that hospital as a project and can give you a pattern with all the tips, tricks, sizes and requirements.
Sure would be nice for your DGS to have your lovingly made quilt, than a generic one supplied by the hospital
Good Luck!!
And continued growth and health for your LO!!