Pin up or Blu-Tack the baby photos and number each one. Give each child a piece of paper with a list of all the children who are at the party on each one.
The children then wander around looking at the photos (and probably at each other) until they have written a number beside each name.
Have a time limit on the game and then see who has the most right. Have an appropriately funny prize for this game-perhaps a big tin of baby powder or a novelty lollipop baby’s dummy!