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At first glance, it may take you a while to work out what's going on here.

On the left is a photo of Vanessa and Melanie Roy in 2014, marking Vanessa's pregnancy with their first child.

In the second photo, on the right, Melanie is pregnant with their second child, and their son Jax is sitting on the floor playing with the sand.

The couple posted the photos to Instagram, expecting nothing more than for their friends to see the pictures, Mirror Online reported.

But it was reposted to Facebook where it soon got seen by millions of people around the world.

Now their second child, daughter Ero, has been born.

Here she is with brother Jax and mum Vanessa:

And here's an incredibly cute picture of Ero with mum Melanie: