It’s a lovely idea for a christening or birthday gift to create a book for the baby itself. For example, leave space for mum to add pictures and names of all their relatives – this is especially welcome if family are far away and the little one won't see relatives often enough to recognise them otherwise. It’s lovely to look through before bed and maybe tell the little one the latest news.
Or you can create a storybook.
Even if you haven't got children to write for - and especially if you haven't ever tried it - write a simple story for a child - perhaps a bedtime story.