Honestly, ginagamit namin yan around 2-3 months pa lang kasi nakita na kami ng slight difference, pero the real game-changer talaga was alternating baby's head position, left cheek one sleep, right cheek next time, plus tummy time when awake. The pillow helps pero hindi siya magic, kailangan talaga ng consistent positioning at movement pa rin, and nakita namin na by 6 months na it started to round out on its own pag active na siya turning her head. Every baby's different though, some respond faster than others, kaya patience lang and maybe check with your pedia kung concerned ka talaga!