There a few things in life more gripping than your child's development. From their earliest moments, we parents obsess about what our children are thinking, seeing, hearing and feeling. What parent has not agonised over whether an early smile was a sign of genuine contentment or the result of some digestive process?

That's why we commissioned Dr Luisa Dilner, one of Britain's leading health and parenting writers, to create a developmental calendar which charts your child's progress from birth to five years old. It will help you to understand what your child understands, and answer questions like "How far can my newborn see?" and "When does my toddler understand the concept of others people's feelings?"

To receive twelve regular e-mails tailored to your individual child(ren)'s progress from birth to five years, all you have to do is join mumsnet.