how would I tell if my babe has vision problems?

[HappiLeigh]

He's almost five weeks old, and in most ways is doing great. Nurses well, prefers mom, spends a decent amount of quiet alert time, coos, makes sucky faces and turns his head in my direction if someone else has him but he hears my voice.

But I feel like at this same age his sister was giving us more signs that she was taking in visual stimulation. She'd stare a long time at faces (especially eyes), started smiling back, and could track objects with her eyes. This little guy doesn't do that. He doesn't seem to stare at faces any longer than anything else, doesn't socially smile, and doesn't track objects. He'll occasionally turn his face toward light, but not often enough that I'm convinced it's a pattern. I know that at this age their vision is still blurry and short-range, but his lack of staring back at my own eyes kind of concerns me. Am I jumping the gun on worrying about this? Does anyone else remember what their own DC was doing, vision-wise, at 5 weeks?

[transylvania_mom]

He's probably fine, my ds did that at 6 weeks check up and my mw wasn't concerned (I understood that many babies still don't have clear vision at that age).
It turned out later that he needs glasses because he's a little farsighted, but he had no vision problems as a toddler or learning to read as a preschooler
As far as I know, you can have her tested at around 3 mo, if I remember correctly, just to make sure everything's ok. My son's ophthalmologist said his eye problem couldn't have been diagnosed before 2 or 3 years of age.
HTH