Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
It depends , what is the location of soft area. As such in 7 months old, the skull bones have not united and there are places in between the bones which appear as gaps. If the soft area is at the place where the soft gap shouldn't be existing then it is a matter of concern. It could be a collection of blood called hematoma
and will need antibiotic treatment to prevent it from getting infected.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
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Wish you good health,
Dr. Srikanth Reddy M.D.