Baby Blue is a fanmade Sing-a-ma-jig in the Singamajig Babies series who is the first one. He is pastel blue, has the same ears as the Teal Sing-a-ma-jig, black circle eyes, an orange nose, a light blue mouth, the same arm pose as the yellow Sing-a-ma-jig, a green shirt saying "My Baby Boy" in red letters, the same feet as the big one from the Gold duet, has the same voice as the pink Sing-a-ma-jig and he sings "Pat-a-Cake". He signs on by saying "Hi Baby!", enters song mode by saying "Song!" and signs off by saying "Bye Bye Baby!".
This is what he looks like.