The first three years are the most important of a human's entire life - it's when we learn to walk, talk and socialise. But as an adult, baby behaviour is both mystifying and fascinating.

Using the latest specialist filming techniques this programme reveals the 'natural history' of a baby starting with newborns and following their growth and development as they become toddlers.

Watch The Secret Life of Babies on Monday, 29 June at 22:00 on BBC Knowledge, channel 184 on DStv.