The posthumanist perspective implies a change in the consideration of the non-human and more-than-human in literacy practices from an ethical-onto-epistemological approach. This research is a systematic review that aims to understand how literacy studies with a posthuman lens host literacy practices at a young age from the relational-material language model, in a broad domain where the human, more-than-human and non-human are connected. This is developed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method, with a selection of 15 research articles from the WOS and Scopus databases. This review highlights the (re)conceptualisation of children's literacy practices from the understanding of the role of the human, non-human and more-than-human, that materials and discourse and literacy practices are indivisible and give rise to the configuration of new narratives - integrating movement, sound, digital, space, time, improvisation, sensations and affections, etc. - and the challenge to the humanist assumptions of literacy practices.