I tend toward the "crunchy" end of the spectrum as far as parenting styles are concerned, but something about this book just bugs me. There are lots of things that I appreciate about the Waldorf approach: creating a calm, loving home environment with reassuring rituals and rhythms through the days, weeks, seasons and years; providing an environment that nurtures creativity, with quality, open-ended toys; limiting "screen time" for young children. Basically, let your kids enjoy their childhoods, let them get outside and get dirty, and take it easy with all the lessons, teams, camps, and enrichment whatever.
If this is your general philosophy, skip this book and try "Simplicity Parenting" by Kim John Payne or "Calm and Compassionate Children", by Susan Dremond. Both of these are Waldorf-inspired, but written for a more mainstream audience. "You are your child's first teacher" is very strongly based on Rudolf Steiner's anthroposophy philosophy. While I think it's possible to appreciate and incorporate many of Steiner's indications, "You are your child's first teacher" is quite dogmatic from my perspective. While others' have commented that they find the author's tone to be supportive I find it to be condescending in a lot of instances. While she pays lip service to the fact that guilt is not helpful to anyone, the exhaustive list of very specific "Do's" in this book can't help but be guilt-inducing, especially for a newer parent.
If you're not familiar with Waldorf, these "Do's" include things like: music in the pentatonic scale (Major scales, with C & F, are "too bright" for a young child and interfere with the "incarnation" process), surrounding an infant in a particular colour (peach blossom), and providing a young child with beeswax for modelling purposes, because clay is too cold and associated with the earth to be appropriate for a young child.
Again I appreciate many aspects of Waldorf education/parenting - I just think that it's possible for kid's to do wet-on-wet watercolour painting while also enjoying markers and puffy paint. You can have play silks AND "dress-up" costumes. Of course you want your children to be comfortable but for my giant-headed kid, cotton shirts with a bit of spandex are perfect - despite the fact that synthetics are so "inappropriate" for children, according to this book. I also think that there are some good toys out there that... wait for it... contain plastic.
If you're looking for a less dogmatic approach, try "Simplicity Parenting" or "Calm and Compassionate Children". If you're already feeling a bit guilty about something in your parenting life, you could also check out "Buddhism for Mothers" by Sarah Napthali. The "Creative Family" by Amanda Soule is more of a craft book than a parenting book, but very sweet and worth the read.