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9 women cannot make 9 babies in 1 month nor 1 women can make 1 baby in 1 month. no concurrency in baby making for sure.

There is some potential concurrency: a woman can produce two or more babies in 9 months, although it is uncommon.

the process is not concurrent. it is still parallel.

Unless the child processes have different fathers, which can and does occasionally happen.

Let's say you have a project with 9 parts. Each part will take ~9 months to complete.

If you take 9 people and give them each one part it will take ~9 months to complete.

If you take one person it will take ~81 months as they need to finish each part before they can go onto the next one.