Make sure you mix water and vinegar together BEFORE you add to baking soda. Then park the pram in the sun for a while; it will dissipate both the vomit and vinegar smell.
You might try washing with a solution of baking soda, vinegar, and water. I would suggest about a cup each of baking soda and vinegar to 3 cups of water. This should be safe for all surfaces.
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