Conventional farrowing pen represents a serious problem in terms of welfare of the sows because the space limitation greatly disrupts sow's behavioural expression which results in long-term stress. The purpose of this research was to determine the behavioural pattern of sows and piglets reared under different farrowing systems which included a conventional farrowing pens with concrete floor and a sow confinement, and in sheds without confinement with an earthen floor. Field research was conducted on the family pig farm OPG Čačić in Taborište near Petrinja during April and May 2021 in conventional farrowing pen. In June and July 2021 research was conducted outdoors where the sows were housed under eaves. The behaviour of sow and piglets was recorded 24 hours a day during the entire period of lactation. The results were different from the starting assumption that sows in a free farrowing system show more exploratory behaviour and that they move more than sows that are kept in conventional farrowing pen. The number and incidence of suckling of piglets was in accordance with the initial assumption that piglets kept in conventional farrowing pen will have a higher number of suckling’s and that the suckling’s will be shorter than in in a free farrowing system. The free farrowing system has positive effects on the behaviour of sows and piglets, but it is definitely necessary to be more observant to avoid the loss of piglets.