I need help, finding a cute way to let my 4&6 year olds know they will finally get a baby brother or sister.

@kermi86, that is cute. I really wanna get pictures or a video of their reaction.
I just gave my son the ultrasound & have him guess . Lol
We made our 6 and 9 year old shirts that said 'big brother' and 'bigger brother' and had them put them on and read them!