Sing a song! It doesn’t much matter what song; the best one’s for newborns are those that mom or dad are singing. Sing about diaper changing, putting on booties, having a bath, looking out of the window - you name it, you can sing about it. Babies love music and they love their parents; they will love their parents singing!
Be sure to smile and it helps if you can laugh at yourself - well, it helped me between my less than appealing sound and the funny lyrics. But we had fun!