'Seerah' (سيرة) is often used to refer to the life of Prophet Muhammad (ﷺ peace be upon him).
Seerah in Arabic comes from the word 'sāra', which means to be on a journey.
Thereby, a person's seerah is that person's journey through life (i.e. their biography).
Nurturing love for the Prophet ﷺ in your child from a young age is very important!
Go on, get to know the greatest man in history!