Are you looking for good pictures or just to please dear baby?
I think the best photo op is to make a baby-sized cake - six inch
diameter or so - to put in front of baby so he can plant his face in
it, dump it on the floor, or do whatever other charming thing he wants.
The banana cake is a good idea. Other possibilities:
-Applesauce cake, without much added sweetner.
-Same as above, subbing some other fruit puree (like apricots or
strained
pears or peaches or durian or wombat or whatever.)
-Some sort of torte based on cracker crumbs (graham crackers, digestive
bisquits, etc etc) that you're comfortable with.
Of course, frosting is the biggest concern. But, for good pictures,
you must have
frosting. Frosted baby birthday pictures are the best. So use
stabilized whipped cream.
You can stabilize with commercial stuff or gelatin.
Greg Zywicki