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For an authoritative source, you might try "Caring for your Baby and Young Child: Birth to Age 5", by the American Academy of Pediatrics. https://www.amazon.co

• dragonwriter 8y ago
  It's authoritative though less than comprehensive, and more (though, unless I'm conflating it with something else, not entirely) focussed on physical health. But, yes, I absolutely do think it's a good one.