A pressure regulating device for use with a breathing assistance apparatus which conveys gases to an infant or a neonate requiring breathing assistance, comprising: a housing (300, 330) including a gases inlet (302, 328), an outlet and an aperture (306, 332,334), said gases inlet (302, 328) adapted to in use be in fluid communication or integrated with a breathing assistance apparatus (115, 118), said outlet adapted to be in use in fluid communication with said infant, said aperture (306, 332,334) enabling the venting through said aperture (306, 332, 334) of a portion of gases that in use are passing through said housing (300, 330) from said inlet to said outlet, and said housing (300, 330) also includes an orifice manifold extending from a side of said housing (300, 330), said orifice manifold arranged at an angle to said housing, said aperture (306, 332, 334) provided on said orifice manifold; wherein the housing (300, 330) includes a flange connected to said outlet which, when used with a mask, enables an operator to apply pressure to fluidicly seal the mask to the neonate's nose and mouth, characterised in that said gases inlet (302, 328) is located substantially on the opposite side of said housing (300, 330) to said aperture (306, 332, 334), a PEEP valve is located between said gases inlet and said aperture, and said aperture (306, 332,334), flange and said housing (300, 330) are adapted so that in use a user can hold said housing (300, 330) in position with one hand, and occlude said aperture (306, 332,334) with one finger of said one hand to vary the pressure at said outlet between PIP with said aperture (306, 332, 334) occluded and all the flow of gases from said inlet passing through said outlet, and PEEP with said aperture (306, 332,334) unoccluded, and a portion of said flow of gases from said inlet passing through said aperture (306, 332,334). a housing (300, 330) including a gases inlet (302, 328), an outlet and an aperture (306, 332,334), said gases inlet (302, 328) adapted to in use be in fluid communication or integrated with a breathing assistance apparatus (115, 118), said outlet adapted to be in use in fluid communication with said infant, said aperture (306, 332,334) enabling the venting through said aperture (306, 332, 334) of a portion of gases that in use are passing through said housing (300, 330) from said inlet to said outlet, and said housing (300, 330) also includes an orifice manifold extending from a side of said housing (300, 330), said orifice manifold arranged at an angle to said housing, said aperture (306, 332, 334) provided on said orifice manifold; wherein the housing (300, 330) includes a flange connected to said outlet which, when used with a mask, enables an operator to apply pressure to fluidicly seal the mask to the neonate's nose and mouth, characterised in that said gases inlet (302, 328) is located substantially on the opposite side of said housing (300, 330) to said aperture (306, 332, 334), a PEEP valve is located between said gases inlet and said aperture, and said aperture (306, 332,334), flange and said housing (300, 330) are adapted so that in use a user can hold said housing (300, 330) in position with one hand, and occlude said aperture (306, 332,334) with one finger of said one hand to vary the pressure at said outlet between PIP with said aperture (306, 332, 334) occluded and all the flow of gases from said inlet passing through said outlet, and PEEP with said aperture (306, 332,334) unoccluded, and a portion of said flow of gases from said inlet passing through said aperture (306, 332,334).