 Barney and Betty are baby-sitting their little baby nephew Marblehead. Fred does not like this, since Barney is unavailable for any activity. And to make matters worse: he does not like babies at all. However, during an afternoon, little Marblehead escapes his crib and goes to the Flintstones backyard and Fred tries to tame his baby-dodging matters. However, after being falsely accused of stealing the kid after his nap, Fred is still on his position not to have a baby around until Wilma in tears tells him a news which will bring him a positive change of heart: she is pregnant with their own child !