This is 'How Babies Are Made', published by Time Life books in 1969. Blake Hampton is responsible for the wonderful illustrations. I haven't included the text (I hope everyone is clear on that sort of thing, and it isn't my place to tell you if not) but I will say that it is admirably forthright, combining the biological side of things with the emotional as well. I have included the perky little dog because I think it's rather amusing, and certainly unique as far as illustrations that I've seen. Although the overall effect is rather heartwarming, I do think that the children and babies look a little bit like Autons, which adds a tang of edginess to proceedings in general.