I actually have a different version of this book, but it has exactly the same patterns in it with just a different cover.
I have now made two items from this book. The first was the cardigan with love hearts all over it & frilly sleeves. I made it for my daughter who at the time was 18 months old, so I made the size to fit 1-2 years. It barely fit her when I finished & she is under the average height/chest etc for her age. Ok so I could have measured her to be sure but I didn't think this would happen. (Oh & I do knit tension squares!)
The second item I made was the star jumper. This time I made it a size too big, as my daughter was around 20 months old when I started this one, so I made the 2-3 years size. The length of the jumper was fine & so were the sleeves, but I couldn't get the neck over her head! It wouldn't even fit over a newborn I doubt! So I had to cut the neck open & add some buttons so it could be fastened instead.
My advice is, this has some lovely knits in it, quite modern, lovely photos, sturdy book with glossy pages & fairly easy to understand (I'm not a pro knitter!) but I would check before casting off that the garment will fit whoever you're making it for!