Child deed poll: change spelling of name (England) - what to do?

I am considering changing the SPELLING of my child’s name.

Example:

From: Saraah

To: Sarah

Literally removing one duplicated A in the name.

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Please can I get advice on what to do, and material impacts to the child’s life if any? All advice is welcome.

Summary:

- child is 2 years old.

- no bank account. ❌

- no school/nursery. ❌

- both parents agree. ✅

- has UK passport. ✅

Thank you.