Hi op, the government guidance on gender identity is non statutory.
This means they don't have to teach it, but if they do they have to comply with guidance.
I'd advise you to put everything in writing and request a meeting covering the specific points you raise:
Seven year olds are prone to misconceptions- how has the teacher ensured that all children know and understand that girls and boys, women and men are sex classes and non changeable.(some pupil voice of your own child's misconceptions would help here, just grab a pad and ask open questions.)
When will the appropriate 'balancing view' as outlined in the DfE be taught. Can you give me a term or date?
How are you defining trans so that the children understand without using stereotypes?
What support is in place for children who these issues address.
How will it be ensured that children have enough correct information about their own sex to make sure they have full understanding and information about puberty.
How will the school provide for gender identity whilst upholding the equality act(changing, toilets) and making sure fairness is achieved for girls(sports day and teams)
And your own points. I'm sure you have many.
I'd then print out the relevant guidance and bring it with me (along with the year 3-6 sex and relationships curriculum and page, with relevant passages highlighted)
Let them know that you will be forwarding to the governors of all your points are not addressed in a timely manner.
After meeting, summarise and send in an email to the head and relevant parties.