When my son was almost 3, I discovered that he remembered something from age 13 months.

When he was 13 months old, I ordered him a pair of dressy shoes online to wear to a family wedding. When they arrived, I got them out for him to try them on and it turned out that they had sent the wrong size (several sizes bigger). I put them in my closet, knowing that he would eventually grow into them. One Christmas when he was almost 3, I pulled them out for him to wear. When he saw them, he said "I can't wear those, they're for the wedding." He remembered who's wedding they were for, but when I reminded him that it had passed, he thought for a minute, and then wanted to know which shoes he wore instead.

I've never really inquired with either of my kids to see what they remember, because it's hard to determine what they remember themselves or from stories we've told them or pictures. But that moment caught me by surprise.