Formation, dynamics and thermal evolution of a collapsing proto-cloud, which was formed after the recombination epoch, is investigated. The mass of the proto-cloud is divided into fragments and their time evolution is followed. The initial conditions for the fragments are taken randomly in order to simulate fluctuations in the density of the cloud. It is shown that after the initial, fast, collapse about one third of the mass is ejected, the remaining core being cooled to a relatively low temperature. After ejection of matter the core has angular momentum, and the hypothesis is that it prevents additional fast collapse of the cloud.