I tossed this rather ugly little book aside when it was given to me for my 6 month old. The pictures seemed very old fashioned and cheap - only some in colour - and it got progressively dingy. Plus the rhyme was witless.
When I moved house, this tumbled out of the books I brought with me, and I was ready to toss it aside again. But I just happened to read it to my daughter and found she was totally engrossed - she was now FOURTEEN months old. The following day, she woke in the middle of the night, screaming and impossible to settle. This was a very rare occurrence, and I wasn't sure what to do, but I remembered she'd been interested in Goodnight Moon the day before and read it to her in a low light. She stopped screaming instantly, and was lulled by the words and by focusing on the dwindling light in the book. Since then, every single time I've read it to her, it has soothed her, when she's been ill, upset, grumpy from lack of sleep or hyperactive. It is some kind of witchcraft, I tell you!
Not as sophisticated, funny or beautiful as ANY of her other books, nevertheless, this is maybe the most important baby book I own. I don't know what's in it that does the trick, but it works. I am also a convert - I find the rhymes and pictures beguiling now.