My niece - mother one one - found this book very useful,
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This review is from: Coping with Two: A Stress-free Guide to Managing a New Baby When You Have Another Child (Paperback)
It is good to see someone who has a practical approach to introducing a second baby into a family without trying to be a perfect mother at the same time. You would think having one child would make you pretty much an expert (which it does I am sure!) but the tips were timely and useful.