But I would also say that by *NOT* using a database you are complicating things not only for yourself but for those who come after you.
Sure, you can use one file per child. But now how do you answer questions such as "How many children are ages 9 or 10?" or "How many children live in XYZ city?"
When you put that data into individual files, that means you have to do this by opening up each individual file, finding that information in the file, and adding (or not adding) to the total. And that's just for very very simple questions.
If you used a database, you could answer questions like that instantly along with much more complex ones (e.g, create a 2-dimensiaonal chart that shows the count of all kids by age and by town).
You are really painting yourself into a hole by not using a database.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.