Watch: Heartwarming reaction of siblings to baby news will make your day
It's a moment in life that most of us greet with love, dread or a faint - or a combination of the three.
And for some absolute hysterics.
That was the reaction of three Dunmurry siblings just after they were told their mother was expecting baby number four.
Matthew (8), Molly (7) and Ben (4) go through the entire gamut of emotions with lots of "happy tears" after being told the news and shown a scan picture.
Mum Sara Loughran said she and husband Marty decided to video the moment as a keepsake, but after posting in on social media it spread like wildfire.
She is a full time student at Queen's studying history.
"We don't do things by half," the 28-year-old told the Belfast Telegraph.
"It's just a nice video we can look back on in years to come and show their new brother, or sister."
Sara is 14 weeks pregnant and planning a private scan to take the whole troop along to see what they are expecting.
"We might film that too - it might be the sequel," she laughed.