One of the least known periods of enfant's life - the first two months - is investigated. The main problem of this period is enfant - adult interaction. As a means of such an interaction crying is considered. Different modulation characteristics are marked out as a result of planned experiment. Typical forms of interaction with an adult during the first month of child's life are reactive, and on the second month they become active. Some qualitative characteristics of crying are described and some examples of interaction changes, when an adult manages to understand "crying language" better, are presented.