Then the breastfeeding might be an interesting angle? How would you support MB returning to work but continuing to breastfeed? You may need to create a plan for taking a child to MB at work or have to know how to give and store expressed milk. Although that's not much to do with the curriculum.
Race and religion - how to foster inclusion and understanding that everyone is different. Also dietary requirements, observing religious customs and festivals.
Disability - reasonable adjustments you would make to allow a child to participate in an activity or how you might modify your evaluation of how a child is responding to EYFSs. Maybe consider relatively common disabilities like speech and language delay, ADHD, AS and/or physical disabilities.
Sex - how to create a gender neutral environment so the boys and girls bathe dollies and play with prams and trains and cars etc. how to avoid gender stereotyping. Have policies that show equal parental responsibility for two parent families. Ie not just mum asked to sign forms. Oh, and not assuming mum is either a SAHM or first point of contact. Asking the parents what would work for them.
Marriage and civil partnership/sexual orientation - how to represent different kinds of families by reading books with two mums or two dads, not assuming that a child's parents are married. You might also include something about blended families? Forms having space for parent's signature not just mother/father's signature.
Forgive me, I know a bit about the Equality Act but very little about early years stuff beyond what my own child's nursery show me now and then.