Nipple of Avent Natural Slow Flow ( 1m with 2 holes) 9oz

Hello mamshy... Sino po dito Avent User na yung 9oz na good for 1 month old slow flow eh parang nakaka lunod tuwing mag dede si baby. Two months old na baby ko pero I wonder bakit nahihirapan siya. Yung gatas laging nag spill at di niya kayang sipsipin as in parang nalulunod talaga. Tuloy plan q na naman bumili ng teat/nipple na 0+ month which is another pesos na naman. Sino po same experience dito and may ibang brand kaya kasya sa Avent Natural. Patulong po please. Need your idea.. Thank you..