Pediatric respiratory nasal mask comprising: - a flexible mask body comprising an internal chamber and an inlet orifice in fluid communication with the internal chamber; - a rigid tubular connector element (12, 12a, 12b) comprising a) an internal gas passage traversing said connector element (12, 12a, 12b), and b) a rigid ball head, said rigid connector element (12, 12a, 12b) being connected to the inlet orifice of the mask body so that the internal gas passage of the connector element (12, 12a, 12b) is in fluid communication with the internal chamber of the mask body; - a holding arm arranged on the mask body and projecting upwardly from said mask body; - a cushion having an aperture for receiving at least part of the patient's nose, when the patient wears the mask; and - two lateral arms (2a, 2b) arranged on each side of the mask body and projecting laterally from said mask body, wherein: - the mask body, the holding arm, the cushion and the two lateral arms (2a, 2b) are made of one single piece of a resilient soft material, the cushion comprising at least one flexible membrane forming a skirt delimiting the aperture, said membrane being made of said resilient soft material and being molded in one piece with the rest of the cushion, - the mask body has a generally triangular tridimensional shape, and the mask is dimensioned for fitting to the nasal region of an infant or a child, and - a rigid annular element comprising a rigid polymer is arranged in the inlet orifice of the mask body, said inlet orifice being arranged at the center of the mask body, and the rigid ball head of the connector element (12, 12a, 12b) being rotatably fixed to the rigid annular element arranged in the inlet orifice. - a flexible mask body comprising an internal chamber and an inlet orifice in fluid communication with the internal chamber; - a rigid tubular connector element (12, 12a, 12b) comprising a) an internal gas passage traversing said connector element (12, 12a, 12b), and b) a rigid ball head, said rigid connector element (12, 12a, 12b) being connected to the inlet orifice of the mask body so that the internal gas passage of the connector element (12, 12a, 12b) is in fluid communication with the internal chamber of the mask body; - a holding arm arranged on the mask body and projecting upwardly from said mask body; - a cushion having an aperture for receiving at least part of the patient's nose, when the patient wears the mask; and - two lateral arms (2a, 2b) arranged on each side of the mask body and projecting laterally from said mask body, - the mask body, the holding arm, the cushion and the two lateral arms (2a, 2b) are made of one single piece of a resilient soft material, the cushion comprising at least one flexible membrane forming a skirt delimiting the aperture, said membrane being made of said resilient soft material and being molded in one piece with the rest of the cushion, - the mask body has a generally triangular tridimensional shape, and the mask is dimensioned for fitting to the nasal region of an infant or a child, and - a rigid annular element comprising a rigid polymer is arranged in the inlet orifice of the mask body, said inlet orifice being arranged at the center of the mask body, and the rigid ball head of the connector element (12, 12a, 12b) being rotatably fixed to the rigid annular element arranged in the inlet orifice.