DD's a pretty good talker. She's just started coming out 4 to 5 word sentences at 19 months, which I'm thrilled about. I'm just wondering at what age your DCs were introduced to a bit of the old ABC? She kind of knows what letters are (although at this stage she's better at recognising numbers in their digit form).
And also, how did you start? The ABC song? She has a foam alphabet in the bath but I don't think she relates it to anything yet, they're just colourful shapes. Fun first, obvs.