Autism Signs? Doesn't follow gaze...

So my LO just turned 9 months and I read an article recently about autism red flags in babies. My LO has done everything early or on time on this list up to his age except for following my gaze when I look away from him he just continues looking at me... is this article realistic? My LO will try to gain my attention again when I look away sometimes by making a noise or grabbing at me. Should I be concerned and bring it up to his pediatrician at his 9 month appointment in a few days?