The speaker imagines being born again and asks what she would change. Each stanza starts by naming something she would keep: her parents, her siblings, her autism, the people she has met. Then she adjusts the details around it. She wants her parents to have less money stress and more free time, her family to be closer, and her friends to arrive at better moments and stay longer.
The autism stanza is the most personal. She doesn't want to be different, but she wishes she had understood herself sooner and been seen more kindly, so she wouldn't feel out of place and her mum wouldn't have to fight for her so often. The mood is gentle, honest and a little lonely, especially in the line about never having to sit alone in silence. It ends warmly, though. She calls the changes small, and what she really wants is happiness, for herself and the people closest to her, shown in a bigger smile.