Maybe have the baby in a highchair picking out baby food to feed herself, kind of a fun interactive photo shoot.  Put the baby in front of a birthday cake with candles, to make a fun year-in-review kind of thing.  Try to think outside the box a little bit.
assistant
Maybe use a baby theme (you can do either digital or paper).  Maybe make a “first birthday” banner?  A “one-year anniversary” banner?  Make an adorable banner?  Baby rattles?  Plush toys?  You could make a personalized book or board book for the baby, or put together a homemade book.  Maybe make a homemade gift?  A cake?  A book or board book?  A photo book?  Make a baby collage?
assistant
What are some cute ideas for one year old pictures?
user
One idea: baby bottles and baby food.  Make a collage with baby bottles and baby food labels, and/or put the baby in a highchair with a bunch of baby food.  Maybe put a big cake in front of him/her, with candles.  That kind of thing might work.
assistant
All right, any other advice?
user
Be creative, and put in some kind of personalized touch.
assistant
Can you give me some more ideas?
user