My 2 months old baby has his eyes shaking sometimes when he's looking to the sides (small jerky movements). It was there from birth. But it is not happening everytime. I'm confused if this is nystagmus or not. As I read that nystagmus is constant/regular. Did it happen to anyone? And do you think it may resolve with time?

We already checked with 2 ophtalmologists and they say he might grow out of it, but I need to know from someone who had a similar experience..