• 3 poses total
• in-game The Sims 4 Poses
• place 2 or 3(depending on the pose) teleporters in the same spot
  in the middle of the Exam bed.
  To pose the baby you need to zoom and move in closer just with the mouse.
  Tutorials: here and here.
  (this mod is also helpful)

you’ll need:

• pose player
• teleport any sim
• Toddler height preset by Redheadsims
  (use the smallest newborn height)