Expectant mum Sarah Bromby from Scunthorpe decided to video the moment where she tells her son Ethan he's going to be a big brother, and she couldn't have made a better decision.
His reaction was adorable, and the video has been viewed thousands of times since Sarah uploaded it to Facebook.
At first he thinks the ultrasound pictures are of him. But when the penny drops his face lights up:
I'm gonna be a new big brother!
Ethan has to ask his mum several times whether she's really, really sure she has a baby in her tummy.
I hope you're not joking.
Ethan's younger sibling is due early 2016 and he can't wait to help look after him/her.
He can sleep in my bed... if he wants.
Let your cup runneth over with cute below:
This video was taken 5wks ago but Ethan is a little excited about some big news - (I've not decided to share with everyone on my friends list just yet) but cat had to come out of the bag to those lucky enough!