Now don't laugh but you need to place a food bowl (with food in) where he is inappropriately soiling. Cats never pee near their food source.
About the sleeping, cats naturally like to sleep up high, admittedly not all cats actually do though. Can you not provide puss with one of those cat towers, some have a nest pad at the top. Puss is probably feeling insecure with a new baby in the house as others have said.
Now that I have written all that, i have found that Cats Protection do some superb downloadable leaflets.
One is called cats and babies... here is the link to the list available....
http://www.cats.org.uk/catcare/leafl...#catsandpeople 