Hindi pa siguro mama, one year olds pa lang talaga tend to prefer certain colors, especially bright ones like yellow kaya super normal lang yan! A few of my mum friends noticed the same thing sa kanilang babies, one swears her daughter was obsessed with red for months, tapos ngayon orange na, so it's really just a phase. But if you want peace of mind, might be good to mention it sa pedia during the next check-up para ma-assess lang properly, especially since you're worried, hindi masakit magpa-check, at least alam na ninyo. For now, don't stress momsh, babies just gravitate sa colors na nakikita nila clearly or gusto nila, hindi necessarily color blindness.