I'm constantly amazed by how much my son (he's two and a half now) seems to know without being told. I took him to Putna monastery in Romania where the relics of his patron saint are and was about to pray before the tomb myself when he went down by himself and kissed the icon. You might think, 'Oh but he's just seen that in church'. That's what my wife and in-laws said, but they weren't with me and he was only just 1 year old! It was truly uncanny. That was the first time he'd ever spontaneously kissed an icon by himself and he picked the one that just happened to be of his patron saint specifically (and they certainly aren't short on icons). It might make me seem a little strange, but I truly believe he knew - little children somehow just seem so much closer to God than us adults. It's somehow effortless for them.
I wish you all the best for your Chrismation, it really is a special time, and I wish your children all the best for their baptisms also.