Quote from TyranidBill »I am pretty sure the baby in the story planeswalked. After he ate the bread he became very vital, and it was said that Merret 'could see an undeniable spark in his eyes'. This may just seem figure of speech, if it wasn't almost immediately followed by 'I think he is going to walk any day now'. Quite subtle, but probably foreshadowing that the baby is indeed a 'walker.
The problem is that that is all explained in the story by the fact that the baby had been munching on bread soaked in the spilled elixir that Merret had stolen from his boss. It’s all very odd but a literal baby planeswalker who can’t even walk apparently seems unlikely.