My 2 year old (2 years 3 months) has become interested in letters and says ABCD when she wants the letters song on the iPad (and she sings along to most of it). But I'm not sure whether I should be teaching her the uppercase alphabet (what I think of as the 'grown-up alphabet') or the lowercase alphabet. She seems to prefer the uppercase alphabet (indeed, I didn't even realise liked the alphabet song until she came out with it), but I somehow feel the lowercase alphabet will be better for when she starts to learn to read. Or do I teach her both?