Estimating the age of a foetus

When a foetus is aborted or born mummified, it is sometimes useful to estimate the age at which the foetus died.

This simple spreadsheet provides a rough guide based on the formulae:

((Crown/rump length mm)/3)+21

Insert the length of your foetus in the yellow box

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A more accurate formula is ((crown/rump length)/3.11)+21.07

The opposite calculation can be carried out.  The pregnant sow is exposed to some mycotoxins - how big would the foetus be?

Causes of stillborn and mummified piglets