The government class 'Early Years' as the time between birth and the end of the Reception year at school when children have turned five. Foundation Years have published a really good guide that explains what your child should roughly be doing at each stage of their development, along with some ideas to help at home.  

What-to-expect-in-the-EYFS-complete-FINAL-16.09-compressed.pdf (foundationyears.org.uk)

If you would like any more information or to talk about this further then please see your child's key person