Jimjams, in her 2nd book, from contented baby to confident child GF does give some guidance on how to deal with a baby and a toddler at the same time.
I too was one of those cluless mothers. I sailed through my pregnancy, treating it all as matter of fact but suddenly when I was presented with this helpless child I fell apart.
I was told to feed her on demand and that it what I did, when she cried I fed her. When my mum expressed concern at how much I was giving her and the fact that she always threw it back up or seemed to scream with stomach ace I was told my the midwife, no she must be going through a growth spurt, so I carried on.
Nothing I did seemed to comfort her, I would spend the entire evening and early hours of the morning with her in every positioon possible to try and ease her pain and stop her screams. My dh had to return to work after a week and I lived away from all my family, they visited once a week.
In desperation I turned to GF and in 1 day everything changed. By structuring her feeds and sleep she became much happier, the colic magically diappeared, I had been overfeeding her after all, mistaking her tired cries for hunger. That first night she didn't go to sleep at 7pm, but she lay happily in my arms for a while, much better than the night before.
I also suffered from PND, but I feel that if it hadn't been for GF it would have been worse. It may seem a bit extreme to be told you must have breakfast by 8pm or lunch at 12.30 but up until then I hadn't been eating, unless you counted the odd choclate bar or pack of crisps. I needed to be told these things. She also wrote that it was ok that I hadn't wanted to breastfeed, all the other books had made me feel so awful for not trying, in fact this was a major issue for me for months.
Before GF i sat in the house all day on my own, after I began to get out and about, meet people and play/interact with dd. I dread to think what state I would be in if I hadn't discovered this book.