What does body blow mean?

A body blow is something that causes great disappointment and difficulty to someone who is trying to achieve something. His resignation was a body blow to the team.

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curdle

separate or cause to separate into curds or lumps.

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What does it mean when baby spit up is curdled?

Babies' spit-up becomes curdled when milk from breastfeeding or formula mixes with the acidic stomach fluid. Time also plays a role here. Immediate spit-up after feeding will probably look like regular milk. If your little one spits up after some time as passed, it's more likely to look curdled milk.

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