Cherries

I bought some cherries the other day. I deseeded one and gave it to W. He thought it was a grape so he willingly ate it. Didn't like it. Today, Jessie said he loved it. Swallowed it whole. She forgot to take out the seed. Fortunately he didn't choke. Am I supposed to keep a lookout in his poo for the pit? I feel like I hear of people doing this when their kid swallows a rock.